Really bad service

Hi, I've have a vw golf 7 2013 model. I've been trying to replace the battery in my key remote. When I initially phoned (end of May 2017) VW Strijdom Park to organise getting the battery changed. I was told that I can just come in without an appointment and they will replace it while I wait. So I went to VW Strijdom Park in June to get the battery replaced, I was told that they where out of stock, but they have logged an order for a new battery and will call me to let me know. It's now mid August and haven't heard anything from VW Strijdom Park. So I phoned them today to find out what's happening. (I.e. I had to call them 9 times in a space of 50 mins, because they keep cutting the call, each time getting a different person on the line. I experienced the same issue in May when i tried calling them). Eventually I was told to speak to the parts department so they can check to see how far my order is. When speaking to the parts department they said they have no record of it, and then I was cut off again. This has gone beyond ridiculous. I've been taking my car to VW Stijdom Park for 4 years now, not to mention that I have to bring my car in on average 3 - 5 times a year every year, from the day I bought it from them as new.