Money taken off my account by FNBconnect

I don’t have a cellphone contract but R206 came off my account from FNBconnect. I phoned FNBconnect to ask what the debit was for. They said they didn’t debit my account because I’m on prepaid so they don’t know what the deduction was for. I phoned FNB and they said FNBconnect did in fact debit my account. So who is telling me the truth and how can I get my R206 back?