u/Almondmeat

Not sure if this is the right place for it but around a month ago I got a repair job done on my bmw 420i (2018). Got the coolant filter housing replaced and then other issues came up soon after I got the car back I think they said the pcv valve needs replacing and it’s just a coincidence that this new issue has come up and it’s not related at all to the work they’ve done

I don’t trust them , where do I stand as I don’t want to go back there and I find it hard to believe that it’s not related at all and feel they didn’t do the coolant filter housing replacement well