MTN upgrade and WORST service! GATVOL and UNHAPPY

I upgraded my contract beginning of June 2020. I only received my phone the 18th of June which I was okay with due to Covid everyone's turn around times was a bit delayed. I upgraded from my previous phone which I had 3 years with NO problems or issues to a Samsung A31 after my friends convinced me that this is the phone to have. From inception the phone gave me problems. Freezing and switching itself off. So I went to MTN Centurion Mall and the very helpful consultant assisted me and reset the settings and said if I experience the same is issues I should book it in. The next day the 1st of July I went back and the same consultant was assisting me and booked in my brand new phone to be repaired!!! Or if I am lucky replaced. In the interim I received my Samsung Buds which was part of the upgrade and also the one bud was dead not working! I phoned Samsung Call Centre and they advised me to book the Buds in for repairs! So I did it and the same time I logged a call/message on Samsung facebook and they rep**** back within 6 hours and provided me with South Africa contact details as they are in the UK. I mailed Samsung and MTN departments OBF and repairs and contact centre and Beeld's Tot U diens and up to date NO NO feedback or any call. In the interim I booked in the Buds and received my new replacements 2 weeks ago. I phoned the MTN store and the lady took my contact details to check if my "repaired" new A31 was there and this is now 7 weeks since I booked in my phone and she never phoned back. I tried to phone times in the days after but no answer. I then went to the store personally on Saturday and the available consultant said that theur logistics person is not working on Saturdays and he won't be able to help me and I should contact Samsung repair centre!!!! Seriously. He then saw I am very unhappy but still polite and then took the card from another consultant to open the storeroom to check if my phone was there. I could see he was not in the mood to help me. He came back with Sorry it is not there. Today is the 1st of September and 2 months after I booked in my new phone with NO PHONE and an upgrade I pay.

What and where must I go now???? Seriously I am GATVOL and Very UNHAPPY. I put in my FB if there is a lawyer that can help me to get this upgrade cancelled and all the costs I incurred to be credited as this is so so BAD!