bad service, false advertising

Nespresso are currently running a campaign which gives you a voucher for coffee and the value depends on the machine you buy. We bought a machine online that gives you R600. when we received the machine there was no voucher in the box. took the POP to cresta and they told us there is an error in the print and that it is infact only R400. according to them the website, terms, adverti*****ts etc are all incorrect. sent an email describing the issue and asking for the balance to be provided to us and received a response 24 hours later telling me about this promo, which firstly doesnt solve the issue and secondly i dont need to be told about this promo again.