Billed wrong Ammount

I am disappointed by the treatment I got on the FNB store , I have been patient with this problem since last year in November but I don't get solution at all instead I get to send from pillar to post.<br> I purchase a Sony Expria Z Ultra cell phone at the cost of 229.00, I was surprised to get statement that the phone cost 399.00, I took up the matter with the store, the same month and I was told that the matter will be solved, I was not informed not even given any update for two month . Without any update of the matter I was shocked to see another debit of 299.00 in my account and previously I explained and it was confirmed it was mistake that I got billed 399.00 in a statement, I called a branch manager again when I got debit in my account on the 25 February and He promise to call ne before the end of the day, till today I don't have any respond from them. I respect this organization but the treatment I am currently getting it's really not on. No feedback and update on this problem.<br>