MTN Service Centre Horrific Service

Hi, I've handed in my phone, which was supp**** faulty, over 8 weeks ago for repairs, got it back with a bloated battery and was immediately returned, two later I get a new replacement with a broken screen, guess what, it needs to be sent in for repairs, which makes no sense as this was supposed to be a new phone, why would it be sent for repairs. The service centre you can phone, if you lucky someone might answer the phone after 5 min of holding or the line just become engaged. I have noted 14 calls and all I get is, its being escalated. I don't want their broken phones sent to me and want my LG V30+ (which cost R16500} re[placed by a phone where they have some type of after sales service. Here are some of my lines due for renewal next month, ********** 505 & ********** 323, do you think I should stay with MTN after service like this and this a business phone. IMEI: ***