Poor Customer service

On 13 Sept.2019 I purchased a 650W WOLF electric edge trimmer at Pick n Pay Hyper Brackenfell. Since I purchased it I used it only used it twice, then it started cutting out after very short periods of use. I do understand that some electrical equipment has an auto cuttout to protect it from overloading, but this was surely not the case as it did not do so when I used it the first time. On 26 Nov.2019 I returned it to Pick n Pay and I was informed that it has to be returned to the supplier for repairs and that I will be contacted soon. I received no feedback at all but each time I enquired about the trimmer (5 times) but only promises that it is still at the supplier and I will be contacted. No response at all!!! Today again, 27 Dec.2019, one month later, I was promised again that I will be contacted in the coming week. Promises again!!! This is totally unacceptable and not the way to treat a customer. Repair or replace the item please.