Vodacom fibre " upgrade voucher " seems ****mish

I currently have 6 different contracts with vodacom... since 1998. Forced to take faster fibre line as one I had was no longer available. Wanted to move to different ISP but after several calls even from supervisor, i took the deal which included a free router (which still has not been delivered because "you already have the same one" and a R500 voucher. I am trying to get voucher but the OTP is being sent to unknown number. Sent 2 x emails also and not one response received. I phoned yesterday *** and explained to lady that answered that I am principle account holder with number 0*********, and that I dont know the number that the OTP is sent to. She took my details and said it will be fixed by Friday. Now it gives me message that my code has expired! And no other feedsback received from either the phone number or email address provided by vodacom. Wonder if my voucher was "taken" by someone else??