Vouchers are ***** and Bad service

I bought a Honor phone online from Telkom in August, the phone included a a watch and R1000. 00 voucher. When the phone was delivered to me it had watch only and no voucher, I tried contacting Telkom reported the issue several times even sent emails but I couldn't get help. I tried redeeming the voucher and it kept on saying the IME has been used already. Even went to the Telkom stores they told me they can't help me because I bought the phone online. Till today I never received the voucher although the person assisted me gave me reassurance that I will get the voucher. The worse thing currently Telkom is debiting my account on the days that we never agreed on for example instead of the 1st it will be on the 15th , secondly they have these inconsistent amounts that they debit. This is really frustrating because at their stores they can't help me I have to call online department which they can't help as well. My Telkom account number is ***. I am highly disappointed with their service they don't fulfil their promises. I wish there was a way to cancel this contract