I accidentally filled petrol in oil tank

Hello, I accidentally put petrol into the oil tank and then drove on with it. I wondered why I could only fill up so little, but didn’t think anything about it. After about 4-5 days the scooter went off on the way home, during the ride, and didn’t start any more. I then put the scooter away and filled the scooter the next day, but this time correctly and not in the oil tank. I tried to kick the scooter after refueling, but the scooter jumped I have a Peugeot scooter that is 24 years old. The battery is also not the latest. I wanted to ask you now if you could help me further.