Cancelled MTN contract, still being charged. Emigrating in 2 weeks.

I attempted to cancel my ongoing contract (which was due for an upgrade in Feb 2019 - So on a month to month) since I'm leaving emigrating in May (2 weeks time), I was told it was cancelled on the phone after explaining I do not want to renew with an "amazing" special offer since I cannot use it - It took a while for me to say I cannot use the contract since I won't be living in the country.

To my surprise - I've been charged again for my contract yesterday and received a statement for my account.

I've verified that the sim card is on prepaid, since it no longer has access to any contract USSD menus. I've attempted to log into mycontract.mtn.co.za but am greeted with a something went wrong contact support.

To top this all off, you go into a store to cancel / query this mess, and you are told to instead phone the service centre. You can take out a contract at MTN stores but may not have any support from the stores!