I was billed twice in one month

I app**** for contract and i was told that i have to pay the first months subscription upfront before my contract could be approved, which i did but to my suprise i was billed again for that first month's subscription. i have spoken to more that 3 consultants who requested that i email thru my bank statement as proof that the payment did go thru but everytime after sending the bank statement none of the consultant ever come back to me