He told the Starbucks barista that he was calling "Aziz". The employee wrote "ISIS" on the mug.

A man dressed in a traditional Middle Eastern tunic told a barista of a Philadelphia Starbucks that he called himself "Aziz". The employee wrote "ISIS" on his mugs.

Niquel Johnson told NBC News that he was dressed in a thobe garment (long-sleeved garment and ankle length) when he had ordered three glasses, one for himself and the others for two friends with whom he was in a nearby store.

When a barista asked him for a name for his order, Johnson said that he had given his Muslim name, "Aziz".

"Abdul Aziz is the usual name, I mean servant of the Almighty," said Johnson, 40, who lives in Philadelphia. "But I've shortened it for them." Aziz "alone means that he's powerful."

He took the drinks but did not notice until 20 minutes later, after returning to a bookstore with his friends, that the name on the three slices was the acronym for Islamic terrorist group ISIS.

"I was first shocked and then angry because I felt like I was being discriminated against," Johnson said.

Starbucks told NBC News Saturday that the barista had misspelled Johnson's name and that the company thought it was a mistake and not a discrimination.

The incident occurred in a Starbucks located on Germantown Avenue, in the same city, where two black men were handcuffed and arrested by Philadelphia police for sitting without order in a Starbucks. Their arrest in April 2018 caused outrage and the following month, Starbucks closed 8,000 sites across the country for an afternoon of anti-bias training.

Johnson stated that his experience on August 25 led him to believe that racial discrimination training was ineffective. "You would think that they would be a little more sensitive and that training would be better."

A Starbucks spokesman said he had investigated the incident. "The client approached and gave him the name" Aziz, "said the spokesman." The barista mistakenly spelled it. "

He also stated that Starbucks had contacted Johnson and had apologized for "this regrettable mistake".

Johnson said he sent an official complaint to Starbucks on Monday with his name, phone number and e-mail address. Describing to society what happened, he wrote: "I feel discriminated against and it is hurtful."

Less than an hour after filing his complaint, Johnson said he had received a customer service email from Starbucks in which he expressed his concern.

A copy of the correspondence has been provided to NBC News.

"I have arranged for a specialist to contact you by phone at the number you provided," says the answer. "We will contact you within 1-2 business days."

A few days later, a Starbucks district official called Johnson to tell him that he thought the problem had been solved earlier in the week when a member of the company had a conversation with a niece of Johnson.

Johnson said no one had spoken to his nieces, who are 13 years old.

When asked by NBC News about the story of Johnson's phone call with the manager, the Starbucks spokesman said that a woman identifying herself as Johnson's niece had contacted the store and was provided details of his experience. They had no reason to believe that she said she was.

When a manager asked the woman to speak directly to Johnson, she added that this would not be necessary, according to the spokesperson, which led him to think that the problem was solved.