Menlyn iStore WORST CUSTOMER SERVICE !! STILL WAITING FOR MONEY THAT IS OWED TO ME!!!!

Have had the most atrocious service from the Menlyn iStore, WAITING FOR MONEY THATS OWED TO ME NOW FOR OVER A MONTH. Took my Macbook pro in for a trade in on the 18th September 2018. The guys helping me made a mess up & thought all I wanted was for them to restore my mac with a new operating system. So after a week I kept on getting messages to collect my device, so I went in to try find out what has happened to my Trade In, this was the 30th Sept. Finally they realise somewhere someone made a mistake but my device wasnt listed as a trade in it was listed for a restore. I can understand that happens. HOWEVER I already sent in all the forms, banking details, Company letter head and ID the last time I was there, no this was lost so we had to provide this information AGAIN. Finally I got my quote & I was promised that I would get a payment notification that same WEEK as I had waited a long time already. However I am then informed that within a week they had changed their Trade in policies, they dont pay you money anymore they now deduct it off a new product. Since I had already purchased the new mac book pro the week prior & they had informed me then that they would EFT me the agreed upon amount, this was also wrong now as policies had changed. The store manager by the name of SUHAIL even gave me his personal phone nr in the hope of reassuring me that should the payment not be made by the end of the following week I should call. Low and behold the phone number he provided me with was incorrect, this couldn't have been my mistake as I had given him my phone to enter his contact details in. So I tried emailing them at the ********** address. A gentleman by the name of Llwellyn gets back to me & asks if SUHAIL has gotten back to me, at this point I am extremely frustrated as they have my old Macbook, I have purchased a BRAND new macbook & I STILL DONT HAVE MY TRADE IN AMOUNt which they owe me. Llewelyn asks me for my information, everything that I had already provided them with, by now THREE times. He assures me the payment will be made in 14 working days, TODAY is the 14th day & I still dont have my money. THIS IS BY FAR THE WORST EXPERIENCE I HAVE EVER HAD WITH APPLE. I am a full APPLE support but this is by far the Worst customer care I have ever experienced!!! Maybe other stores are better BUT DO not visit the Menlyn branch!!!