Bad service with Michanic Mobile Mechanics

The worst experience ever in my life with Michanic Mobile Mechanics, I have spent over R40000 with the company to get my car running with no issues, after major service done with the company hardly 2x months my car started having problems of not charging the battery, i reported and they told me its auxi****y battery, I paid almost R6000 for the auxi****y battery but issue not resolved, they came back and said it's alternator not charging and i paid almost R6000 again for alternator reconditioning but after a month again i got stuck due to battery not charging, I have to tow the car back home, they came and take the alternator out to rework it which I stayed now for almost three weeks without a car, they came back and fitted the alternator and again said the battery is low, they took the battery to the workshop to charge it, they then came and fitted the battery but the car couldn't start. The alternator is still not charging. I'm trying to be professional with them but I'm fed up. I'm struggling to get to work because their auto electrician has messed up my alternator. The main battery is also new as I've paid almost R6000 for it. Right now I'm stuck with a car not running and I'm struggling to get to work due to their poor service. The R6k spent on auxi****y battery was unnecessary, the R6k I've spent for alternator recon is not giving results, the R6k ive spent on the main battery still not giving results, not to mention the overall almost R20k I've spent on service. Please help me as I need my car running before the end of this week. I trusted them with my car but right now I regret everything that is happening..