Springs Hyundai Used Cars

So I bought a used Mazda BT50 2014 model with FSH from Hyundai Springs the sales lady Eilleen was awesome up to collecting my car, had to wait nearly a month to get the balance in cash from my trade-in which I only got once I complained on Face Book, it was apparently a hold up from head offices side? I have noticed a vibration on my vehicle, tried having the wheel balancing and alignment done and the problem is still there. Contacted the saleslady Eillen today 8 March she tells me I have a 1500km or 30 days period after which its my problem, this was never discussed with ever !!!. So I collected the vehicle on the 10 Feb and obviously I have done over 1500 km albeit just a little over, So why waste your time going to a reputable dealership if you going to get a fat toffee . Eilleens words are Ross Henderson says its for my account ? Quite dissapointed