Refund

I submitted a new banking details, then they did not update it n charged me double for two months that it has bounced, then I went to the store in green stone, the store manager told me its not the stores fault but billing department, then I called billing department, the billing department told me its not their fault but stores fault. I then over payed, I have been calling then for the past 3minth months regarding my refund. Their giving me runaround. Yesterday I called then, they told me their still investigating, they will call me, and they never call