Retrenchment claim

We continue to get the worst service from Woolworths, after holding for 27min my mom's query is still not resolved, the call got cut after 44min and no courtesy for them to call back. Didn't take the name of the gentleman in their complaints section but he confirmed the retrenchment claim was settled. The biggest issue is the account was handed over to MBD says there's a balance of +- 900 that she still owes and the gentleman I spoke to says it's - +400, my request was that Woolies should inform their debt collector of the correct balance if anything at all is still owed, secondly we need a statement showing the interest which was charged because something is not adding up, Woolies says balance is around 400 and MBD says its around 900. PLEASE SORT OUT THE MESS BECAUSE with MBD, Woolies was informed in time of my mom's retrenchment and now she'll have to pay arrears