*********** staff at vodacom

Over 2 years ago I took out two phone contracts.. They debited more then the agreement was so I went to vodacom to sort it out no one could assist me so I gave the two phones back one was unopened and I said if no one can sort this out take your phones back so ever since I gave the phones back I keep being harassed for payment.. Why should I pay for the phones when I gave it back staff don't put a note on the system or communicate but they want the money. Can someone get this of my name please. I logged a query as well in the beginning of this year the lady said she will assist but nothing.. EC-218V-1V6GXA. My number is ***