Overcharged monthly accounts

Good day, I am at my wit's end, my 2year contract expired in June and a sales consultant called me to renew in May 2018. I made it vehemently clear that I was interested in a new cellphone contract but not any insurance. I was directed to make contact with that institution myself and request the Cancellation. I did so, only to be informed that the Cancellation was only effective after 30 days. I received an email to confirm. All in order. However, my router was also up for renewal and telephonic ally I took up the new contract and once again, requested no insurance. This call was recorded. But, since I have commenced the new contract, I have never paid the agreed upon installment. There is always a higher amount being debited off my account. I personally visited a Telkom franchise, the consultant emailed the Rep for the inurane... I was told that yes, indeed my router had an insurance attached to it. Please help. I do not want any insurance. Help me understand, if my agreed contract amount should be R370pm, why have amounts of over R500, been debited off my account. I'm so disgusted and completely irate.