OVER CHARGING MY ACCOUNT

i have cancelled my wifi rooters within the 7day period, vodacom is still charging me for this!! for three months, they owe me R665.00 and no one can assist between the cancellation department and account department. it is showing on the system that the 2 wifi rooters are cancelled yet they are still billing me!!! i have complained on facebook as well no response. i get cut off while talking to a consultant then get transferred from one division to the next. no one actually knows what they are doing clearly and it is getting very frustrating having to call them every month regarding my credit due to me!! this is very frustrating knowing how *********** your staff is. i need this issue resolved. i am not prepared to wait a further 7 to 21 working days for my money to be credited back to my bank account!! having to deal with this issue for 3 months is now enough!! been on the phone for over 2 hours with vodacom and not one person out of maybe 6 or 7 people that i have spoken to can help me!! your staff clearly need training because they dont know how to resolve issues regarding overcharging clients!!i am completely exhausted having to try and resolve this!! enough is enough