Homeloan cancellation rip-off

I purchased a house in January 2019, which only got registered in July 2019 last year - Bond account number can be provided, but call reference number given below. We then decided to sell the house shortly after registration and started the process by calling you home loans department to give them notification. I've done this twice within a 6 month window, with the last notification expiring on 26 January 2020. If notification was provided, and bond payments made monthly, why am I having to pay in excess of R50K to cancel this bond? I feel extremely cheated, especially because I followed the procedure.