Poor customer service

Good morning, I had a rather unsatisfactory encounter with the MAKRO store in Vanderbijlpark. I purchased a LG microwave there in November of 2018. The microwave has become problematic in that it switches off automatically after two seconds. The store floor manager ( Shawn) was not really interested in assisting saying he hears what I am saying but cannot help because of the store policy. I then requested to speak to the store manager and was told that I would have to wait however he (Shawn) could not say as to how long it'll take as the manager is in a meeting. I tried calling MAKRO head office of which the number was provided by Shawn. I came through to the call centre who could not put me through to someone at head office and my call was forwarded to MAKRO Vanderbijlpark. Eventually the store manager (Paulus) pitched and was also not sympathetic and quoted store policies. He further stated that the supplier is closed and could not give a clear indication as to when the supplier would open, and that there's a huge backlog of repairs. I asked him what can be done about the replacement of the microwave as it is what I use for reheating precooked meals, He then suggested that I purchase another microwave in the interim until they can repair my microwave. This is totally unacceptable more so I'm a pensioner and do not have funds to purchase another microwave whilst waiting for who knows how long it'll take to repair.