Pathetic Customer Service

It is so sad that after 4 attempts i have to come to this. I took my husbands car in for a 105 000 service and it was advised that a oil change is all that is needed. After that day the car was serviced it has been hell. Everything else has gone wrong. after the car was serviced while driving it home i experienced a very weird jerk especially on a incline. took it back to them and i was told i has to book it in. i booked it in i was advised the spark plugs needs to be changed. After the spark plugs have been changed the car was still jerking i had to book it in again. then i was told there was a coil issue that needs replacing. Took back in and that was done a week later the EPC light came on and the car just has no speed. this is highly frustrating as this car was bought brand new had all services done on it by Hatfield Bruma with no issue the only reason i changed dealerships is for convenience. And what makes it worst is when a coils have been changed the parts was not given back to me. we now contacted the service manager hoping this will be sorted if not i shall exhaust all avenues to get to the highest person in charge. this is unacceptable service.