Due to squeak both wheel bearings exchanged

Hello, I have a relatively “old” suffering at my Twingo. When driving straight ahead it happens again and again that from the direction of the tires comes a very loud quit (very high tone, mainly at speeds from 70 km?!). It did not occur for some time and this summer it was reinforced again. Since I had to buy new all-year tyres this year before the winter, I also addressed this problem immediately. The suspicion was expressed that the wheel bearings were defective and that there were I think it was also said that there was only a double pack. After the repair, the squeaking occurred again, unfortunately, and now also mainly during the impact. A friend looked at the car on the lifting platform and asked first of all, if I was informed, that the left drive shaft cuff is completely rubble and one could have replaced it immediately. It was also astonished that the wheel bearings were replaced in the event of irregular noises, which would normally cause “grumble” or grinding noises in the event of defects. It would rather type on contact of the brake pads or any metal parts with the brake cheeks. Now my questions: How can you check whether the wheel bearings were actually replaced? How much does a wheel bearing exchange cost at the Twingo? Is it necessary to replace both wheel bearings after a tyre change (on the existing rims) or a wheel bearing change to carry out an axle measurement? Do I not usually get a measurement report afterwards? I know a lot of questions, but I have a funny feeling! Just write me what you think of the matter and how I best proceed. Thank you in advance and many greetings Summerbreeze