Double debit

I spoke to a Moses Mo***eng on Jan 6 2016 and he confirmed and assured me that my number had been migrated to a plan where I would be able to top up and that my monthly fee would be R206 if im not mistaken. Ive just gone thru mu bank statement and I noted that on Feb 23 R938.66 and R406.88 was debited on 23 Feb 2016. what the hell was the two amounts for because for the whole of Feb I bought my own airtime and data i never once asked you to increase my limit you ******!!! I want an explanation and this time I will be porting to another service provider because even your signal is ****py!!!!