I had took a router ...

I had took a router with them 2 years ago and in February this year I got an sms that they have handed me over with MBD debtors and I should pay my outstanding balance with them and I did that but I kept on getting calls from another debtors I had enquires with vodacom and MBD and ask that the work it amongst themselves and give me resolutions, but I wake up to a debit order we did not agree upon