Account not Credited and No response

Since May I keep getting invoices for outstanding installation. I have Telkom/Vumatel package. Telkom advise they have paid Vumatel. For some unknown reason I get invoiced for two different account numbers 155259 and 105361? I only have one installation. Where has the Telkom payment gone. Again emailed accounts dept on 24 Oct, 31 Oct and to Support Dept on 6 November. Still no response to these emails. Pathetic service.