Poor workmanship

I have been taking my car for service to Hyundai Springfield for many years now. Last week my car went in for service. I was advised that I needed to changed my alternator and ac belt as they advised it isn't safe to drive like that, keeping in mind my car made no noise or gave me trouble regarding the belts. I told them to keep the old belts in the car so I could inspect it. I was given my car a day later and had paid the amount theh requested for the belts and service doesn't cover that. After fetching my car, I Had 3 mechanics look at the belt and there wasn't anything wrong with my old belts. I then hear disturbing noises from my car the morning after. I had booked it in again. According to them the belts needed adjusting. I then leave home and wait there since 6am as there is a que to follow. I fetched my car yesterday and this morning the noise is worse! Hyundai Springfield think we as customers have time to run back and fourth with them. They don't seem to be getting anything right. I called them this morning and they advised to book it in again. I told the foreman im not prepared to sarifice my time as this is an inconvenience to me! He says he will come out to me....On the 2 occasions I've experienced this, I have taken videos of the sounds and sent it to them. Their workmanship is pathetic! We spend money to maintain a reliable vehicle and this is the service we get. Very upsetting and disappointing being a loyal customer for years