Tyres been changed

Sent my vehicle in to get the Cluster checked and 4 of my new tyres was changed with older tryes, Dealership denies it and cannot provide camera footage of my vehicle being with them for 2 days , Sales lady who sold me the vehicle also claims that the vehicle had new tyres, set up a meeting with them and conviently they advised that we can do it on a certain week when the sales lady was not in , and offered me a free alignment,