False advertising checkers liqour

Very dissapointed came to buy Tanquaray which was on special that had a free 6 pack of pink tonic but when i got to the till I was confronted by a very rude trainee manager and cashier who told me that they were out of stock of the free pink tonic when i requested to be given something else I was told to come back after a week to collect the tonic. So really did not get the point of advertising something they did not have instock and management was not able to resolve my issue. Will definitely taking my business some where else and please learn to train your staff were customers.