Line disconnected and SIM card blocked "scratched"

I am a contract suscriber for past 3 months having migrated from prepaid to contract due to getting an allowance for cellphone.I paid account last month on 25th received sms from Vodacom to confirm,checked "My Vodacom" app to ensure payment reflected.Also reviewed next invoice and confirmed no arrears,next payment due 01 October.To my dismay Vodacom blocked my cell and sim today.Called the helpline from a colleagues phone and Melissa told me to take phone to Vodacom in Waterfront,at my own expense and time.I was then told by Ronald,very helpful Tech,that my account is in arears and I will first need to pay a ridiculous amount and do a sim swap before line will be activated.I questioned the bill and sim swap.According to Ronald Vodacom "scratched" my sim remotely and I must do a sim swap.I now want to cancel contract and return handsets to Vodacom.I have sent mail to the following addresses; ********** ********** ********** ; ********** STILL NO RESPONSE. Vodacom you have lost yet another customer due to right hand not knowing what the left hand is doing.Someone please contact me to arrange cancellation of contract.I am employed as HSE Officer and use my phone for work purposes mostly.Glad to say the whole site is talking about Vodacom now,and no good reviews so far.Please note that my current number belongs to me and cannot be blocked.I migrated using my same prepaid number to contract.