Unhappy customer

I bought a 2017 Ford Fiest from Kia Edenvale last year in October . Not even a year later and not even done 5000km from purchase the cambelt snapped and this service is not due. We pulled out the invoices for the service history and found out that the engine was overhauled before and we were not told about this. Kia Edenvale refuses to take responsibility for this and will not assist. The car was bought from them not even a year ago and not even 5000km was done from purchase and they say it's not there fault. The manager from used cars as not clue what he is doing and I advise everyone not to purchase a car from them as they is no aftersales support or help.