pathetic service

I visited the vodashop in canal walk to upgrade my handset o n 02 September to the Samsung galaxy s6 edge. I was then advised that because my package for September had already started I would only be billed for my upgrade at end October. Upon going to pay my phone bill I was them charged nearly double for this month which I was not informed that I would be paying for part of the new package as well. This is pathetic and unacceptable as I should have been informed about the enormous charge in the store whilst upgrading. Vodacom should really look at who they hire and also the service in such stores where the working hours are long as I could even see while being assisted that the person was drained and his service alone that evening was horrid.