Debiet to much money

Good day . On the first of May 2018 vodacom debiet the amount of R744 of my bank account.I phoned them the same day and they said they made the mistake on their side and and they need to refund me R129.00 today is the 10 th may and still i didnt received my money. I phoned them and they tell me they want my bank statement. I dont understand what does my bank statements got the do with them. they have my bank account number. When i phoned on the 3rd May they told me the money is in the prosess to go back into my bank account so when i spoke to Prince he says i cant have my money back if i didnt sent them my bankstatments this is bull**** service