Bad Customer Service from Mambo's staff

Mambo's Brackenfell, has the most unfriendly and unhelpful staff. Mambo's is advertising a Sunny Shell Pit in lime green. When I visited the store there was no stock of the green but the Durbanville branch had one which they would send over to the Brackenfell Branch. I left my contact details and was promised that I would be contacted, this did not happen. After enquiring after a few days I was informed the order was in the store and I could collect. A few minutes later I was informed that is was the wrong order delivered to the wrong branch and they were not sure when the new stock would arrive. Why do companies advertise a product which they no longer stock.