Misleading clients about the tyre warranty

Hi q Port Shepstone branch misled us about their tyre warranty. Bought 2 sets of tyres and fitted them there. We were told to bring the tyres back if we have like pot hole damage etc they will change and give us a new tyre for free. Just after 4 weeks I hit a pot hole and took it there. They told me to pay 50%which they never told about when I bought the tyres. They now telling that I don't have a top up that will pay 100% of the damage which I was never told also. I don't recommend any one to buy tyres at HI-Q PORT SHEPSTONE BRANCH