My phone only rings once and then hangs up on incoming calls

My phone only rings once and then hangs up on incoming calls

I had Cox cable come out because they said I must change over to their new digital service… When they left here my phone no longer worked. If I have an incoming call it rings once and then does not let you pick up the phone :( I blame Cox cable but they came back out and said that it was my phone, I said that’s funny because it was working just fine until you came and change it to digital service.