rules and regulations don't apply

so there we go to Rustica in Moreletta,Wekker str for a Saturday lunch as we frequent the establishment quite regularly.Upon arrival,being seated by our usual waitress and knowing exactly what we are going to order we are informed that since we are redeeming the Entertainer app vouchers to compensate for the meals that the Entertainer policies has since changed ,and that irrespective of the amount of pax per table utilizing the vouchers or not,only 1 voucher could be redeemed."Really"we however were a party of 5.my wife,daugter,her fiancee and the 5 yr old and myself.We all have the app,but taken into consideration only 2 voucher would have been redeemed and that we usually pay for the grandson seeing he consumes so little.I immediately questioned this because i found this quite strange as we have been doing ever since i can recall and specifically at Rustica.NB.It was also mentioned by the manager when summoned that the drinks ordered per that table could also not be redeemed as per Entertainer voucher,and that they had a meeting with the owner that very morining to change the rules.Even my 5yr old grandson said"how can you eat and not have drinks"Well i refrained from arguing and accepted "their"rules and left and had lunch at Spur Glenfair.I have since contacted Entertainer and stated my case ,whereby they informed me that no business can change the rules set out between the business and Entertainer at their own discretion.I had just had to confirm although i already knew this.I have since also mailed the manager and owner and is awaiting their response in this regard.Entertainer assured me they would look into the matter and revert back to me within 24/48hrs.