My refund

I want my money back that they debited to my account , its seems Vodacom its a **** now, they hand over my account to SAYA RECOVIES ,SAYA RECOVRIES debited to my account and also Vodacom debited to my account but now when I go to Vodacom they told me that my debit order does not appear to their system, I even send the bank statement but still no respond ,I am angry now because when you call Vodacom finance after I gave them my ID number they will tell you now that their computer are restarting they will drop the phone, what must I do now. I have email Vodacom legal collection several times I have two references, they lady called me they tell me that they are still investigating escalating my query for how long cause its been a week now.