Day light *******. Can my contract end now

I need help. I contacted MTN in May and I was told my contract for data is expiring in November 2021. I have been paying R299. This morning I got this message… Y'ello! Your contract term has ended. “Your contract is changing from R299.012 to R 1642.61 on a month-to-month term. All promos have expired.”

I contacted their call centre immediately and I was told that my contract expired yesterday. I asked her why then was I told that it expires in November, the lady responded and said to me their systems had a problem so it was giving them false dates, they need to refresh their system 3 times before getting a correct date of expiration. But she said I need to pay R1800 . Is this not day light *******. Then I said can she cancel the contract she said she can’t do it only during the week. Please help me where can I report this