SR***- 2 wifi accounts at the same address- please cancel 1

I took a router from vodacom, but was declined. My husband was accepted, and 2 days later I was accepted. We took my husbands router on his account, but send my one back with the courier. Now I am being billed since last year April, as well as my husband- and that is for the same address! I have been calling, getting different SR numbers. My credit score is being negatively affected and I just cant seem to get anyone who can solve this issue! Does it take too much to grasp that you CAN NOT HAVE 2 wifi accounts for the same address, and that is people that is married! Please sort this!