Reasonably priced food and expensive drinks which were taken away while getting food from the buffet

We randomly passed by Centro bar in the heart of Montecatini Terme and saw an offer, which says aperitiv and snacks from the buffet (all you can eat) for 10€. That's certainly a good price for a downtown bar. The food, the drink and the ambiance were not bad (even though we only had plastic fork and knife). BUT: when we left our place to get some food from the buffet the waiter cleaned up our table (including our drinks, which where still half full). We complained and got the information, that we can order new drinks, which I didn't want, because my drink alone was at 7€. (Someone is malicious thinking that this act was systematic). I insisted to get drinks back, which are at least half filled up. After a few discussions we got drinks back, which looked like our old drinks. My girlfriends glas was dirty from outside, the straw of my drink was dirty from inside. Both drinks looked like someone already drunk from them. We weren't sure, that they brought out OUR old drinks and therefore didn't touch them. And also the Centro bar couldn't be 100% sure that they didn't brought us some random drinks. Fact is, that a bar, which makes a mistake like in our case cannot bring out old, dirty glass (that's last but not least unhygienic). We insisted again and talked to the chef waiter. He was talking a lot from the surveillance cameras all over the place and that never ever a waiter in his bar would bring out old glass. We are sure, that the bar tenders didn't make new drinks for us. I asked him how to solve the problem. His answer was: you have to pay the full amount. There was no intention to believe us, or to find a peaceful solution. That's also the reason for our rating. We are usually not the the kind of people who give detailed ratings like this one. But we do think, that people should know, this bar is treating their guests unfriendly and unfair.