I live in the netherlands and my e-bike suddenly goes 32 km/h

So i bought an e-bike (hitway bk7s) which i supposed was legal. At first it only went up to 25 km/h. But after i went on vacation and kept it charging accidentally it started going 32 km/h with no effort. I don't know why it did that or how to change it back. So i stopped using my bike. But i didn't do anything with the bike so what should i do? The warranty i had is over so i can't just get a new one. Does anyone know what to do? I would really appriciate it!