Russell's disrespectful attitude to customers and rotten customer service with false ads

So I see an add for a dstv hd decoder and dish with free installation for R599 at Russell's,me and my fiancee call the local branch in Vanderbijlpark,the lady on the phone states that since installers dont work weekends we should come in on Monday,we specifically ask If there will be enough stock where by she replies there will be enough left as they also receive stock every Monday we, must simply call for the manager when we arrive and they will help us fast,come Monday my fiancee goes to the shop and is treated like a small child,the staff takes 15 min to help and the manager says he knows nothing of this,brenda is not even at work,when I talk to the manager via cellphone he promise me to get back wth an answer regarding stock availability within the day,I recieved no call from him,so do we as customer now have to beg Russell's to simply give basic customer care and keep their word on promotions that they run or do they simply lie to get customers in the shop then reward them with absolutely pathetic service and poor manager s****s,the manager could not even give me a proper answer on what je was going to do to help me get the product I want as the promotion is going till the 9th of December?