Unknown activities happening to my bank account

I launch a complain with FNB bank that there are activities on my accounts that do no make sense to me. I have transactions that I cant account to, I cancelled my online banking and never used again since October 2015 to date. I have airtime bought that reflect in statement and it reflects as if airtime was bought by me and for my phone but when I phoned vodacom they also saw one transaction that was made by me e.g. R99 airtime dated 28/12/15 I didn't make that transaction I even phoned vodacom it didn't reflect on their system as well but was on my FNB statement. My first complaint to them was launched in October 2015, I made changes to my card stopped online banking and even changed my card BUT I still experienced ********** activities in my account.