Exorbitant amounts debited from my bank account

I have a straight for forward contract with Vodacom for 249 a month. 200mb data free. I did not use the sim card as I merely upgraded for the handset. I noticed today an amount of R2532.58 debited from my bank. On further investigation R1308.27 was taken at the of November and R3300.27 Will be deducted at the end of January 2018. I repeat that I do not use this sim card. On query with customer care i was told to wait while they investigate this matter. At no time did I agree to have an open line on this contract. In the meanwhile my other debit orders are being returned. Unacceptable! I demand a full refund for november as well as december. Pathetic service offered to a customer that hasn't missed a single payment ever.