2 Faulty handsets in a row

Was due for an upgrade in march 2017 Took an iphone 7+ Speaker was not working properly from day 1 Mtn said it needs a sim swop Did that, phone got worse as time went on. Couldnt hear ppl while on calls. Eventually videos recorded without sound. Could only take handset to Mtn Repair Centre Midrand. I live in Mpumalanga. Took th handset back & was declared faulty. Battled for 3 to 4 months trying to take it to an mtn store near me. They wont help u as they are not mtn direct stores. Got a replacement handset in August. Took an S8 After my husband battled to get all info from an ios to an android for two weeks, I started using the handset. The videos played as though I was using a phone from 1990! As shocking as it sounds its true. Spoke to samsung & they said its a faulty handset. Spoke to Mtn direct had to follow the same procedure again. Tried many times to get a supervisor or manager to assist me. The sales agent will tell u that they will call u back & they never do. Ive been waiting for over a month for Sunil who is Chiba Jeetendras supervisor from Mtn direct to call me back. I still havnt got a call from him to assist me further. Had to take the phone back to Mtn Repair centre Midrand. At the Repair centre they said that I shudnt gv the extras back now, I can gv it back when my new phone arrives. I called the sales agent above to find out what to do, he did not answer my call. I called the call centre & I held on for assistance until the gentleman @ the repair centre was done with declaring the handset faulty. I waited over 15 minutes in the Q & eventually I took it in good faith that mtn would pickup the sd card, dex station & keyboard when they deliver a new device as I could not get hold of them. The next day the sales agent above from mtn direct contacted me & when I related what had happened, he said that I needed to return everything to mtn repair centre in midrand & until its all returned I cannot get a new handset! I arranged for a courier company to take the remaining goods on monday 18 September 2017. On Monday afternoon I asked Chiba via sms: "How can I speed this process up This is a second faulty handset from mtn. Its quite annoying to keep on getting faulty handsets" This was his reply "Ask the ppl the u handed it to to speed it up" Wen I asked y is he being rude, This was his reply: "No as I can't speed the return on my side therefore I asked I to check wit them or did u not ask me how to speed this up" Disgusting attitude from a sales agent who is supposed to provide help. I called 808 asking for assistance from a supervisor. A lady called me Wednesday mning & said she will get a supervisor from mtn direct to call me. No1 called me till now! I then called the repair centre yesterday 19 September & they told me that Mtn direct should further assist me as everything on their side is sorted out. I called Mtn on this number (011) ********** A supervisor Pat listened to my complaint & said she will call me back shortly. I waited till 4pm yesterday & called back. She said she will sort it put in an hour before end of business & call me back. I waited... NOTHING! Today I called back @ 11:05 & asked for her, the receptionist said that she is getting her system sorted out, she cant tk my call right now & will call me back in 30 min to an hour. I asked & if she does not, she said I promise mam she will call u back in maximum time an hour. It is now 13:14, this supervisor did not call me back!! PETER PLEASE HELP ME.