airtime

Today I recharged with 55 and it disappeared when I phoned they said it was app updates that used it all so I changed updates and turned off mobile data and recharged with 110 and went on fb for literally 5 min and logged off.went to check my balance and it was 0..This is ridiculous! You mean to tell me 165 airtime just goes when I went online for 5 min..I Ave been a customer for 12 years and never had issues before this.iam fed up and seriously thinking of moving to another provider who will treat me better. When I phoned I got told there is nothing they can do and I have to phone tommorrow for the department who deals with this...extremely disappointed and angry