ROLA Motor Group SUCKS !!!!!!’n

I have had the absolute worst experience with the Rola Group. In March 23 , I purchased a mercedes benz. It was not advertised as having an air suspension which is not standard for that model. It was a 2016 model with a mileage of 56k. In July 2023 the suspension failed , the verbally said that the shocks may need to be changed , but in the end , they only changed 1. I trusted them. In November 2023 again the suspension failed , causing the battery to go flat which I replaced twice. I took the car back to Rola as this was an existing issue that was wither not assessed properly or not fixed properly. Rola is refusing to pay for the replacement of the part citing normal “wear and tear” ? This was not my first car , i have driven older cars for longer and did not have a suspension problem ever , let alone a recurring 1. I trusted the vehicle brand and the Rola brand , but this has been such a bad experience. Investing a lot of money in a car in march that has been un driveable for almost 2 months now. Iv had to incur extra costs of using and uber and both Mercedes and Rola are just sticking to the narrative that the car is out of warranty. Is it normal for an air suspension of a 7 year only car with only 59k on the clock to have suspension problems. Its is normal for this problem not to have been detected before the car was sold or at the first the vehicle was taken back? I am so disappointed in the quality of Mercedes and the treatment Rola MG offered me.