Bad Service and feedback at Sportscene Maynard Mall

I bought aHisense U972 at Sportscene Maynard mall wynberg in September 2016 and it gave me problems with battery right from the start.I took it back to them to be returned to Hisense.It sat in their shop for a week until I had gone to check only to find it wasn't sent to Hisense because I had not signed a certain document which no one told me about.The phone came back and again no one notified me as they had promised till I went to check.Second episode, in July 2017 the phone's LCD gave up and i took it in again on the 28th of July 2017, signed all the necessary documents and doublechecked with the assistant if all was well in trying to avoid the previous delay.The assistant assured me it was fine.August passed then I went to check if the phone was back from Hisense on the 7 th of September and no one could help me cz the guy who deals with phones was off.They promised to call m and inform me if the phone was back from Hisense which they never did.I went back again on the 21st of September only to find that my phone was never sent to Hisense for repairs.it was sitting for a month and some weeks at their shop.The reason according to them I did not submit proof of purchase form.the very same form they took from me when I sent it back the first time and never gave me back.They gave me a purchase slip and I had no idea they should have made a copy of the form and returned the original to me.So apparently Hisense can't take it back without that,but,Sportscene has a copy of this form in their records but the staff is too lazy to dig in their records.Im absolutely sure they never returned it to me the first time and I had no way of knowing it because I as a customer rely with information from them on how everything works. The cellphone guy then tried to give n back the unrepaired phone that's still under guarantee claiming he shall look for the duplicate form and call me which he hasn't done up to now.I refused to take the phone because I have proof I bought it from them in the form of a till slip and they have it in their records too and its not the first time I'm sending the phone back. I really feel Sportscene Maynard mall branch staff is lazy, they will send you from pillar to post without anyone solving your problem.I'm so upset about this.