SINGAPORE - A Pizza Hut Singapore customer has found the words "Pink Fat Lady" written on her pizza takeaway receipt at the Bukit Merah outlet on Sunday evening.

Posting a photo of the receipt, the customer, Facebook user Aili Si, wrote on Pizza Hut Singapore's Facebook page on Sunday night: "I don't think it is nice for your staff to describe me as such on my receipt...As a customer I definitely hope to be treated with basic respect deserved by any others. I hope to receive an apology from the staff and Pizza Hut."

She added: "Just feel insulted. What's wrong being plus size? I'm a customer and I pay for my pizza! Not that I'm get it for free!"

On Monday, Pizza Hut Singapore replied to her post on Facebook and said that the incident has "definitely rocked us in our seats".

It wrote: "That should not have happened at all and we feel that we cannot begin to appropriately apologise to you at this point, but we are, indeed, sorry for this...Our team is keen on finding out further details of this incident in order to launch an investigation."

In response to queries, Pizza Hut Singapore's senior marketing director Juliana Lim said that they have been in touch with Ms Si and apologised for the incident.

"She expressed her understanding of the matter, which was a genuine error of judgement with no intent to offend, and has accepted our apology. We are grateful to her feedback and as a result, we are taking measures to improve our customer service standards," said Ms Lim.

Ms Si told The Straits Times she would not like to pursue the matter further.

"I appreciate Pizza Hut's effort in addressing this matter and handling it in the best possible way they can," she said. "I would also like to thank the public who support and focused on the idea of good customer service at a fundamental level."

She added: "And to the public who focused mainly on the negative effects regarding obesity, I sincerely request you to be sympathetic and to open your hearts and minds to what an obese individual may be facing that many may not be able to see on the surface."