Trying to merge account

When my mother passed away earlier (June) in the year, i had the account changed into my name. Since then i receive 2 bills from Telkom for the same number after having it changed inside a store. The bill comes in my name for the account and the internet service is still billed in my moms name, even though all appeared together when the bill was in her name. I have tried calling the call centres on numerous occasions but neither billing nor sales can assist and i get transferred endlessly between the two when i have called and still no resolution.