MTN service sucks

A few months ago i recieved a call from one of mtn service provider advising me that one of my contract is up for an upgrade...so a lady by the name of Tina assisted me...she advised me that my contract came to term 26 feb 22..i asked her are u sure this contractvhas come to term...she advised yes mam the contract came to term 26th feb 2022.i advised her that i went to a store and they told me my contract is not up its will come to term next year...she the insisted that the contract has come to term...she then told me when my other contracts are coming to term...she then advised me that MTN owes me because they was still billing me for the full months even after ny contract had come to term..she then asvised me she will log a call for me with the relevant department for a refund cos MTN was billing me for the full contract for March ,April and May...she then advised me of the different packages.i then told her which phone i wanted...we concluded the contract she told me wen the fone will be delivered in 2 to 3 weeks...the weeks passed no cell fone....i then recieved a call from a department saying they the ***** department and they were making sure that i did the contract...the lady asked me to do a security check after that she advised me ibwill rec a call from the courier company...weeks went by still nothing ...we called the number that Tina called from explained the story to a guy Solomon...he asvised the upgrade was not done with Tina...he then advised he will help me...he did everything also asked the question is the number due for the upgrade he said yes....concluded the contract and the fone was delivered...a month passed and i see a debit order went off on my acc for over R7000.00...i then stopped that debit order call Solomon and he advised he will investigate. I then went to a MTN shop to pay my normal monthly subscription as i did not want them to block the lines while they investigating....he then tells my husband that it was a system error on their side and the upgrade was not due...so mu husband advised him my wife is not goung to oay that money because u did not advise her the upgrade was not due. Two days ago we discovered the lines are suspended for an error that was made on MTN side cos i did pay my monthly subscription for the month...their is really bad and i refuse to pay that early upgrade fee for an error that happened on their side...at this stage MTN leaves a bitter taste in my mouth.. i hope they sort this out and someone calls me