A restaurant in Kuala Lumpur which allegedly imposed RM10 as air-conditioning charges would be investigated by the Domestic Trade, Cooperatives and Consumerism Ministry, after a customer uploaded an image of a receipt which went viral on social media.

Its minister Hamzah Zainuddin said the restaurant admitted there might have been a mistake by one of its employees when preparing the bill.

He said the restaurant did indeed have an air-conditioning charge for customers who booked a room for a specific event, or those who wanted more privacy, and that it would be notified to the customer in advance.

"Some restaurants have charges like that for customers who book a room for a specific event, and it is not against the law if it is communicated to customers.

"Only in this case, we cannot be sure whether the customer had dined in the room or outside, as we have not met the person," he told reporters after officially opening the ministry's 44th enforcement day celebration in Putrajaya today.

The picture of a receipt dated April 15 from a mamak restaurant in Bangsar displaying an air- conditioning charge of RM10, went viral on social media, and drew flak from the public.

- Bernama