Vodacom Collecting fees but not assisting

I experienced ***** on my bank account, which resulted in a non-payement. The payment was made and the account fully upto date when i requested an upgrade and was told that they would not upgrade me due to non-payment despite having written confirmation that my account was upto date and not in arrears.

i subsequently requested a cancellation and was quoted R1800 to cancel, Despite numerous calls I am yet to receive the cancellation quotation and Vodacom continues to charge me monthly premiums. They claim I now owe R2800 despite the fact that they have failed to allow me to cancel as is my CPA right