
I've no advice on the tracing of phone numbers but I've been in a similar situation . After selling my husbands speed boat a man had it a few weeks wrecked the engine then wanted his money back. My hubby was working abroad and I had no money in the house to give him. He came round with his mates and said he'd give us 24hours to get his money (which I didn't have) if I didn't he'd kill both me and my son who was a baby in arms then burn us in our house!
I was in shock so gave my son to a family member to look after so at least he was safe. I called the police at the time and they refused to come out , they said they couldn't do anything unless he had actually harmed me or my child first!
The next day I had my husbands friends at the house with me for security , they did turn up when they said but backed off when they seen all the men surround them , the main man shouted what he was going to do to us again so I had plenty witness' but yet again the police wouldn't even give them a warning.
I didn't sleep properly for weeks until I found out one of my hubby's friends had been and sorted the situation out at his house , I didn't really realise how close our friends really were until this happened.
The whole gang were on the front page of our local newspaper last year and were all jailed for numerous years for serious offences. I felt very lucky when I saw it but felt angry with the police for not helping.
I hope the police help you more than Northumbria police helped me.
Can you get some friends to come over and stay with you tonight? I know you must be worried sick!