I have to say as a former MB Leeds Employee, it was the car I was the most disappointed in when working my way through the range. However it proved the maxim, that Mercedes do not do small well. those Komprssor engines are awful, but the minute you drop a big lumpy unit in to any of the range you have a cracking car.
So sorry this hasn’t worked out for you, and I can understand why you bought it in the first place.
It’s all good experience (albeit and expensive one!)