Vodacom & Hammond Pole vs Annita Hendriks

I have been trying to cancel a Vodacom cell line ( ********** 580) since November 2017. On 12 April 2018, I was given an account with an outstanding amount (by email) that I paid in full the following day. The details into which bank account payment had to be made and the reference was given to me by Vodacom. In June 2018, Vodacom handed the account over to Hammond Pole Attorneys (ref HP. ********** ). Vodacom is now saying the money was paid into the wrong account with the wrong reference - remembering they gave me this info by email. Now want the money repaid, but it is sitting in someone's account. When I phone Vodacom (no matter which department) I get told to call Hammond Pole. When I call Hammond Pole they say only Vodacom can help me. I have even tried getting help from Vodacom in India. No one is interested in helping, they just want payment. Never mind that it was made in April 2018 and Hammond Pole have added some crazy amount to the outstanding amount, which they are trying to get me to pay and I am not being credited for the amount paid in April 2018. At Vodacom the line is "deleted". Now what?????