Loss of trust. My windscreen washers failed on my lsh ex demo 15 month old car, Booked a slot with Mercedes Tamworth, I explained after they failed I topped up the washer bottle, still did not work. This was the first time I had lifted the bonnet. Before they would check the car, I had to sign the job sheet agreeing to pay for repairs, thinking I could not possibly have caused the fault, as only they had worked on the car, including a recent service,I reluctantly signed. Apparently it was my fault and cleaned the system, again I reluctantly paid up. Yep two days later, failed again. This time I was told it was the pump which was at fault, this would be replaced under warranty, when it was completed, I asked if I was due a refund, owing to the fact it was a faulty pump. The answer was yes, it will be with you in a couple of days. A month on, no refund, tried to talk with service, same reply with a customer will call you back when free. I did not receive invoice for the work, but I do have the card machine ticket. Iam still £78 out of pocket and feel cheated, it in total 4 visits and 1 month to complete a simple repair.