Poor Customer Service

I had my car repaired at Renew-it Randburg. I had to take it back 4 times to have it sorted out after the initial repairs due to poor workmanship. Last week I was promised that their mobile team will come out to sort out the outstanding issue. I cancelled my appointments, waited the whole day and no one came. I called Elam 3 times, she did not take my calls. I called the reception and left a message for her, she still didn't return my call. Is this what customer service is all about. Make empty promises then avoid customers afterwards? Over and above this, their website says that customers can claim a fuel voucher if they are inconvenienced. Having done multiple trips to them, I tried claiming for the voucher and nothing was done about it. Can the branch manager call me back or someone who really takes customers seriously.