Doesn't know what to do.

So on the 11th December I go to the telkom mobile branch in Springs. I then query the fact that I can upgrade I then get told my date is only for the 27th Dec so I accept. I then fill in all paperwork and chose my phone witch was the Samsung A7 I get told that there is none in stock it might take 3 months I then fight and say then why advertise if so.. All means I chose the Samsung S6 and go home.. I then feel that I want to go cheaper rather than paying more.. I phone 8 times no answer I then send a email on the 14th December asking they should phone me I get a call back and we change everything to the A5 Samsung I'm all happy and she promised it would be ready by the 30th Dec.. I emailed them again to remind her to please order and go ahead the dates.. 28 Dec. 29 Dec and 30 Dec still no reply. I then went in on the 31 th December and asked if my stuff is ready she said no you cancelled I then get mad and said this is unacceptable I emailed you she then sees my emails and tells me that they have none of them phones in stock that I want phone's branches they also don't have.. I now have a phone I don't want and a to expensive bill after I said I was told no paying for extra