Worst after service

Most pathetic service ever. My car has been in their workshop for over a month now, the first week they claimed for a part (same part replaced by them just a few months before)from my extended warranty, it took them a week to determine the fault that actually needs repair. They claimed again, upon which an assessor was appointed. Assessor determined that 1st part should not have been replaced, causing my insurer to deduct the first amount from the second claim. Through all of this the communication from the service advisor was non existent. She claims that she communicated with me and my husband, but it was only ever to phone back when one of us phoned to follow up and then to tell us she will let us know what is going on. I had to physically go to the branch to get answers and wait in their office for her to sort out the claim, which she didn't understand. The part was ordered and then upon following up I had to hear that the part is on a 3 week back order and their directors are not willing to buy a part from another dealer because I have an extended warranty. It is now more than 3 weeks later and once again I phoned to follow up today, with a promise to be called back... still waiting. They expect me to pay for the 1st part, I have been waiting for more than 2 weeks for the invoice. My car is stuck in their workshop, it is costing me a lot of extra money to get to where I need to be. There is no end in sight. This is just the latest of me having to deal with these *********** people in the last 2 years, since buying my car from them. Will not recommend BB Mahindra to anyone.