Worst customer service at MTN

I am very much dissatisfied with the service I received at MTN store in polokwane(schoeman street branch). I app**** for a contract deal which was a package of 2 HUAWEI P smart cellphones and I got approved. We did all the paperwork, signed the contract and I was given my 2 cellphones and the consultant who was helping me, Octavia, never bothered to advice or shed any light regarding insurance or guarantee/warranty. She only advised me or asked me buy the screen protector which I did buy because I knew that it will keep my phone safe. The screen protector did not cover the whole screen, it was leaving the 4 corners of the screen exposed and I asked her if it's the right size for for the phone and she said it is the one for HUAWEI P smart. After a month, my phone fell and cracked at the top of the screen (exactly at that part of the screen which was not covered by the screen protector). I went back to them and they all said the screen protector that I bought wasn't the right size for the phone, unfortunately Octavia, the lady who sold me the phones and the screen protector was on leave. Now they say the HUAWEI model that I bought doesn't have warranty, they will have to order a new one and I must pay the price of a new one. My biggest question is why am I being told now? I believe I deserved to be told all this before I took the contract and the worst is that the consultant made me buy the wrong screen protector and now that screen protector is not damaged but the phone got damaged. How can a phone with the screen protector on get damaged without the screen protector getting damaged? I asked to see the branch manager and she said she is sorry and there's nothing she can do about the situation and it's unfortunate that they no longer have the screen protector for the model in stock. I am really ****ed and now i am stuck with a phone that is damaged.