Mahindra And Mahindra — Recurrent new problem in car following servicing

Address:

itanagar

I have been facing problem with mahindra servicing, itanagar since the very begining. During my 1st servicing they kept me waiting till 2 pm even to wash my car and it took till 4.30 pm to finish servicing my car.
After 2nd servicing, i discovered that my parking sensor stopped working and when i informed them about the same, they suggested me to replace entire circuit which i refused. But now after 29k km my parking sensor are suddenly working again.
During my 3rd servicing, they didn't had enough A/C filter and so it was left unchanged.
Last week i had my 4th servicing and as they put back everything i noticed that my right front headlight stopped working. To repair it they had one A/C mechanic working to fix it . After i took my car and while going through seculded and interior place i noticed my left headlight stopped working.
Iam really fed up of recurrent malfunctions in my car post servicing . kindly help