False contract price

I signed up for a contract in Northgate branch based on a store brochure which was still valid. Upon signing up I found out the actual price on the system was R 80 more than advertised. The staff were unhelpful and shrugged the incident off saying I must just live with it. In insistence I got them to call customer support and was told they reserve the right to change the contact price any time they want. There was nothing I could do. Advertising a product then tying a person to a contract at a different price amounts to *****. This is a **** and it seems I am not the only victim. There was absolutely no customer service to help me either.