Poor Customer service

I have signed a contract last year October for Huawei P8 Lite phone and it was coming with a band and contract was approved. When I was supposed to collect them they told me that band is out of stock and they can’t give me phone alone without band, they’ll keep phone until band is available After numerous attempts of phone calls and visiting their store, for two months they were telling me the same reason that they’re having a problem with logistic and it’ll be available in the next week and next week is next week. In January they told me that band is available butt I’ve to bring in new bank statement as the one they have is more than 3 months. I did bring it and when they supposed to give me phone and band they told me that their prices we have agreed on has increased and now I have to pay more. I have told them that that’s not my problem as the problem was between them and logistic. Their manager told me that she will investigate and will come back to me even today I’m still waiting for feedback.