MTN's service is PATHETIC

I wanted to upgrade my contract in December 2020 but was unable to do so because the consultant told me that my account is in arrears. First time I heard about that and my line was soft barred aswell.. I phoned 135 and the consultant told me that my February 2020 inv is outstanding but its still on their old system but she can put me thru to a consultant on the old system. I told the 2nd consultant that I have proof of every months payments and she gave me her email adres. Ive then sent her all the proof of payments. I did not receive any reply from her but my line was activated again up until the 1st of Jan when it was cut again... I went to a MTN shop this morning but their hands also seem to be cut off. They also can only do so much at the MTN shop's these days as they only could take all the proof Ive printed out and log a ticket from their side.. This is utterly pathetic service from MTN.