Picknpay not assisting with Sodastream upgrade

Wanted to upgrade my sodastream machine at Picknpay hyper Ottery on 27/11/2021. Was given 3 different excuses and left with having to purchase the product outright. I approached the Customer Service desk, explain to the consultant that I want to trade in my old machine and to receive a discount on the newest model. Please note that there is a sign up on wall at the desk reading SODASTREAM UPGRADE and the consultant reads the info and she looks unsure and walks me over to the Kiosk desk, where the 2 ladies have a conversation and walk me back to the customer service desk, they both read the sign and the 1st feedback received is that they can assist me but unfortunately the new machine is no longer in stock and I must return when there is stock. Not buying the story I enter the store to that department and low and behold enough stock for a small army. I then return to consultant and notice the sign SODASTREAM UPGRADE is now removed from the wall and then I request a manager, the manager arrives and then the 2nd excuse is that they can only do the upgrade when Sodastream the company gives them the open window to do upgrades. When I call them out on the bull**** story the 3rd excuse just to get rid of me is that they no longer do Sodastream upgrades. Consumer Protection Act clearly has to come into play. I bought the machine at full retail price, no one taking ownership for the false info and lack of customer service provided