***** ON MY VODACOM ACCOUNT

Somebody upgrade my Vodacom account on 2015-01-16, for two months my data was finished before month end. I bought R250 data in February and R100.00 data in March it never happens before, when I get my account it was R899.00 before the upgrade it was 168.99 . I call the call centre go from one person to another , the person told me That I must do an affidavit at the police station and fax it to *** that I did not upgrade my account. But no back feed received, after several calls to the call centre and a lot of time spend on the phone everybody told me just wait 2 days then the problem will be fixed. On 20 th May I have fax another letter to explain my situation and ask for proof of receiving the handset and upgrading so that I can handed the person over .I don't know what to do can you please help me