A Domino's manager has apologised for "really awful service" after a family accidentally chowed down on pizzas with meat on them, despite being religiously vegetarian.

Jaideep Saini said his family's religious values meant they would not eat meat, but part way through eating what they thought were vegetarian pizzas, he discovered ham in them.

"Being religiously vegetarian, my family innocently ate ham in their pizza until I noticed the pizzas were not vegetarian and I stopped them from eating," Saini told the Herald.

"Very disappointed as our religious values have been hurt by Dominos New Zealand."

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He took the pizzas back to Domino's Papakura for a refund and was told it would take three to five business days for the refund to process.

Domino's Papakura manager Nishan Singh had not been working on Friday when the incident happened.

"That's really awful service from us," he said.

While the evening shift on Friday might have been a busy one, Singh said it was no excuse for the mistake.

"If it's a busy time, everybody has to do their job properly ... a mistake is a mistake.

"It might be somebody was careless," he said.

"I can say that we really apologise, all the Domino's staff apologise, it won't happen again."

He said he would call a meeting with his staff over the incident.

Singh said if Saini would like to come back into the store and speak to him he would ensure he got his refund and would remake the order for him for free.