Day light roberry

Vodacom debited my account with R150 after the contract has expired, when I called I was told invoice was issued on the 3rd of November. When I called Vodacom in the beginning of the month the airtime of R150 reflected on my account and the reverse it on the same day but invoice was not reversed. Can I have my refund back because I was billed for nothing. When I called the lady who answered the phone cannot even explained it to me. The contract already expired and called two months before it lapsed. Imagine paying R150 for nothing and cannot be explained.