Products on special advertised wrong

i bought a home theatre system from the above, on the ad it said Sony DDW 5500 Home Theatre system, price was R 7999, now R 3999, when i took delivery there was no remote or Sub Amplifier, the system is designed to work with a separate amplifier and receiver unit, they just said sorry, no remote or amp, a few days later i walk into the store and the same system is there with an Amp proudly next to it, i asked the Manager how that works and he just said sorry, you bought it as is, if it was advertised as a partial system i would agree, but no, it clearly states Sony HTS, i dont mind that its a display unit hence the lower price, but its still supposed to be complete if advertised like that. i am not happy