Payment dispute

I am unable to open up a new contract from the Istore with Telkom being the provider due to a credit owed on my Telkom account. No one is able to assist me from Telkom, When I call the billing team I am on hold forever and can never get through to the correct agent. No one in store can assist me either for some reason. Please can someone provide me with a direct contact number or email address to get this sorted out as it is holding up my application for a new contract. I have not had a contract with Telkom since 2019 and this issue is still ongoing.