Wifi password

We had to have a service repair tech to the house. When he asked for our WIFI password, I gave him the one that was given to us almost a decade ago when we first got Telus Internet. He said that was not it and downloaded on his cell what he said was the password. The problem is that our original password had 10 characters and the one he downloaded appears to have 5 times that many. All our devices remained connected. We want to buy a new IPAD Can we just sign into the WIFI with old password? Did the service tech reset our password? If he did, how do we sign in new devices? How do we get that password?