*****ulant transactions where done on my contracts

I have two active accounts where i pay not more than 450 per month.in july i received a statement of 1456 upon investigation a UPS top up line upgrade was done and a samsung phone was taken.these transations happened at the glen and bethlehem and definetely not by me.i submitted an affidavit and id copy as per your staffs advice it has been a month im now expected to pay over 3000 and worst of all nobody has contacted me i have made follow ups with the branch nothing has happened about this up to so far.my contracts have now been blocked.