Change of account

Have been trying to transfer the contract from my wife's name to the business account. The debit order goes off the business account. This has been for a number of months. The business is registered in my wife's name and she is 100% owner. She has taken in all the relevant documents twice to Telkom at the Springs Mall and emailed them to customer service. What is required? She is trying to get a data SIM and they say FNB won't allow a Debicheck but I don't agree.