promises VS what you get

Supersonic sells me one thing and delivers something completely different , its as if their sales department and billing are two different entities that do not communicate at all , I've been communicating with the supersonic team and they have been helpful however still not delivering what i originally signed up for , fibre was recently installed in my area by vumatel , supersonic had sent representatives to my area regarding the promotion they have going on saying you will get a 20/20 line for R599 a month , firstly supersonic did not bill me this amount , finally after querying this , they come to me saying i will be billed the original agreed amount of R599 for 3 months? then will revert to the original amount? what original amount ? the agreement was a 20/20 line for R599 .

deliver what was promised, don't sell me on false deals