Poor Poor Service from Attorneys

We have been trying to resolve an account since March where MBD first told us that we owe them almost R8k for our Vodacom account which was handed over in March 2021. After querying this the amount came down to approximately R4.7k whereas the Vodacom statement shows R2.7 (approximately and dates February in 2021) Customer care doesn't CARE to answer the phone NOR emails and the call center is all but useless with "managers" giving out incorrect email addresses. I am trying to settle an account and simply want to understand where the additional monies come from but no one seems to be able to assist.