Bad service

I took my bmw e92 325i, cfg42240 for service at GP motor works in randburg around November and Dec 2024 and now it's misfiring. I'm so unhappy with their service and it's also shacking. I won't recommend people to take their cars there. There service it's not up to standard. Now I'm stressing cause of misfiring mad the sound that comes out of the exhaust it's so bad. The shacking when I excellerate it's worse and wonder why they didn't do the thoroughly check up and now I'm in Cape Town. My name is Papa Ramose - 064 465 5809