MTN switch contract phones off

I have 2 contracts with MTN.i have change jobs on the 1 February,so I went to them to make arrangements for payment because I'd not get paid end January.they made a note on the system,but in the middle of the month.phones were put off.i went in to the Greenacres branch to find out why it was done.they said I must phone in again,but at the same time I got some money and paid the account.I was then billed doubled end of February by MTN,went in again and they said I must go to my bank to reverse the one payment.it was done but my bank reversed bother so I had to make another payment at the branch.my contact phones is being put on and off from January 2020 until now must take off from my work to in every time I have paid them up to date .they cannot examine to me why the phones are being put off.yesterday was my last visit to mtn and still no feedback.I want to cancell this contract with them cause I had enough.my husband and daughter can't phone and they are inconveniencing me by taking off from my work to go and see the.I have printed all my proof of payments from each month but no feedback.reason given yesterday they are short staff because of the CV virus.yes I do understand,but sins February no one phoned me with any explanation given. When I phone each person has got a different story,because I changed my debit date,then I dit not pay for November ,then it was the date on their system when they bill me don't know what that means the short staff they working on itI had it with them.