Second hand car trouble

I bought two vehicles from this dealer - when purchasing these vehicles we where not informed that they had been involved in accidents or that the bonnet/front of vehicles had been resprayed - it seems that it is perhaps habit if it happened to both vehicles - the result is that my merc bonnet started losing it’s paint last year and that one can see the primer - it looks disgusting (bought2017) and now the Ford (bought 2019)has also started losing colour and showing primer - if the job had been properly I would never have been any the wiser and happy. I will gave to repaint both vehicles to make them look decent - I will not buy another vehicle from there ever