Appalling Manager

I go to this restaurant, I was at the restaurant having the Sushi Buffet and had a bottle of wine. While my glass is stiff full. A bug goes into my glass of wine, it was still alive and moving. The manager comes to me and says it is out of their control, and brought me a new glass. They spilt the wine, didn’t even offer to repour that glass back, or any remorse at all. When time to pay- I say no I will not be paying for the glass you spilt. The manger says it’s my own liability ??? it’s my liability they have bugs in their restaurant. Wow! Anyway paid for it and left because didn’t want to talk much. But how Appalling- for a manger to even handle such a situation like this. Had they shown some remorse- I would’ve even said no don’t worry it happens. But the level of disrespect and poor management service I found so upsetting! The managers name is Gilbert (not sure of spelling but sounded as such) The restaurant is in Cedar Square, fourways. If I could rate it Zero star I would!