Overcharged

I downgraded my package to R100 on june due to lockdown, I decided to upgrade to dstv compact for R399. Now when I chech my balance they say I must pat R779 I'm R260 overdue for upgrade. I feel like they are robbing me I should I pay R260 for upgrade? Multichoice is taking advantage of us not everyone is getting a salary I'm not working but I want better thing for my family. I won't pay R260 for upgrade.