RAIN CHARGING CANCELLED SIMCARDS

I am so sick and tired of dealing with Rain's incompetence. I was billed from 1 June to 25 June a total of R836.00. After calling and emailing their customer care no one was able to assist me and gave me no help at all in resolving the query at all, AMANDA HLUSHANI had told me that you use the rain network and then pay which i still dont understand because i was BILLED TWICE IN ONE MONTH. I then requested for the sim to BE CANCELLED so that i can pay the outstanding amount. I have not used the rain ever since 1 JULY 2021. Today my outstanding amount is R1650! HOW IS THAT POSSIBLE. Please resolve this account and give your staff better training,