OP. Have you at any stage taken the car back to MMS and let them diagnose what is wrong and give them the opportunity rectify the problem?

If a plumber fucks up at your house and you have a leak are you really going to pay another plumber to rip out his work and start again?? Take the car back to MMS, kiss and make up and get the car sorted.

__________________
Bye bye betty blue. Hello F6.