SMS that I purchased airtime!

I received a sms on the 02/10/17 "thank you for accepting R55 airtime". I do NOT need airtime!I phoned in asap, was giving another 086 number then a 087 number even got a Ref ********** 743. Unfortunately they could not find any account, giving my ID, cell number, account number, but still NO ONE get see that I got an account! Strange! I also do not receive ANY accounts, so easy no I cannot see if that amount is on the account! I had to made phone calls and was on the phone for 74 min!! Who is going to pay this? If they do not help me soon, I will be forced to contact the Ombudsman!