Dear Restaurant Manager.
I am writing to express my disappointment with my recent visit to your restaurant. This was surprising for me, as I have always considered it one of my favourite places to eat.
In the past, I have really enjoyed the friendly atmosphere, the high quality of the food, and the excellent customer service. That is why I regularly recommended your restaurant to friends and family and chose to visit again.
Unfortunately, during my most recent visit, several things went wrong. We had to wait a very long time before our order was taken, and when the food finally arrived, it was cold and not prepared as requested. In addition, one of the staff members was unhelpful when we politely mentioned the issue, which made the experience even more disappointing.
I believe this situation does not reflect the usual standards of your restaurant. I would appreciate an apology and a suitable solution, such as a refund, discount, or voucher, to show that you value your customers and take feedback seriously.
I hope you will look into this matter and take steps to ensure it does not happen again. I would like to continue visiting your restaurant, but only if the quality and service return to the high level I have experienced before.
Yours sincerely.