Double debit and refund

I am so angry with blue label i had a very bad experience from the very first month of activating a contract with them I have been double debited for 4 months no when i call in was told to send my bank statement i did send however whenever i call in to do a follow up regarding my refund they tell me they can't see my statement . I spoke to one of the supervisors he told me i will receive a feedback in 21days its been 3 months now waiting for my refund and they are still double debiting from my account