paid my phone bill but I still don't have service

I'm trying to find out if anyone else has had the same issue as me and if so was your issue ever resolved. So my service was disconnected and I paid my phone bill, but I tried to make a phone call and received a message that my service was still inactive. I tried calling and chatting but of course the call center is closed at the moment. I will have to wait like 2 hours. When I called back and tried to use the same pin number the recording said that the pin had already been used. Did I pay someone else's phone bill or something? I know that I shouldn't have lost my phone number yet because the service end date was just yesterday. Please help because I don't know what to do. I am currently low on cash so I can't go and buy another card and take the risk of this happening again.