Vodacom *****

I am having trouble with Vodacom as they keep sending me accounts...the last one being R26 061.19, and I don't even have a contract with them! About six years ago I changed from Vodacom to MTN because of a poor signal, but it seems that someone in their offices gladly grabbed this opportunity to ***** MY INFORMATION. I had a Vodacom modem for when I visited friends or family away from home, for which I paid - by debit order - a monthly bill of R109.00, but cancelled this as I didn't use it often enough and it increased to R149.00 p/m. I have sent several complaints to Vodacom ***** departement but to no avail. I do not have this absurd amount as I am a pensioner. The first account I received was for an amount of R2 222.56 (ref no H2-5IQPV for cell number + ********** 1777) and I managed to get the amount reversed by ABSA. Next I received an account for R4 503.22 (ref no H2-5XQ7M, same cell number). And so it keeps going on..... but to have to pay R26 061.19 for a cell number that I know nothing of is preposterous.... (ref no H2 7WJFZ for cell number + ********** 185)