I took a contract with MTN for a home WiFi at R399 in November 2023

I took a contract with MTN for a home WiFi at R399 in November 2023. July 2024 I saw a deduction of R265 until August with a significant decrease in my internet speed reaching 100percent fair usage by the 10th of every month . When I enquired I was told my package was migrated to a lower package without my consent or notification. In order for them to migrate my package back I have to pay an upfront payment . I however paid over R500 upfront payment when I took my contract . So disappointed and frustrated at such a money making scheme to de***** customers. I had been enquiring since July initially about this migration without being asssited ,being taken from pillar to post by consultants that knew nothing about their job.