UNKNOMW DEBIT ORDER

i have a debit order of R99 that i noticed today and for showmax ********** 6363, when i check my statement from december 2016 , they were busy debit my dicovery credit card , when i called this ********** 363 a white lady , she said they were billing worng account it was suppose to be her credit card and she had a quiry with vodacom to cancel this contract but now vodacom is billing me for something i dont know , i need my money as from the when thy started debiting my account.