Poor service by Mercedes Midrand

I took my A250 sport for a service on the 19th February. The radio went off a day before the service. They did the service which was under the motor plan but they could not resolve the radio being off, they mentioned they are trying to program the car but the car is refusing. They replaced the module, the head track, tried different computer machines but still. I asked them to check whether other dealerships have had the same issue and how they resolved it? They say no need to do that.

I honestly am reaching the point where I want the car written off I go buy a bmw which will be more reliable as I have checked with friends and more supported.

To add to this, they took 2 weeks to decide to offer me a rental. The Mercedes contract states if the car is kept for more than 2 days they offer this to you.