Quality assurance

We bought a vivo car and it's facing a problem with the boot lock.<br> We sent the car to the agent several time to fix the problem and they failed.<br> I phoned the head office to complain and they asked me to give them other chance.<br> I took the car yesterday and it was ok with the boot. <br> <br> This morning I did discover the lock system not working from inside. <br> So they create new problem. <br> <br> I phoned the head office and they told me this is new problem and not the boot problem and I must go back to them.<br> <br> I told her but the new problem become from the old problem and I don't have time at all to go and comeback<br> <br> Now I have to give them the car to them again and again and again???<br> <br> I don't see a any quality assurance<br> The team not qualified at all.