Emily S
Cheap ain't nice and nice ain't cheap <3
I once had similar and had to log the calls through my network provider after getting a crime number.The police won't trace the number as they can only request the details of the mobile number in a very severe case. I know as I had a weird stalker ring me a few times and they couldn't reveal the details due to data protection. The police man said to me basically you would have to be murdered before they would release any details
If you do have this issue again it is possible to be traced, don't give up. Mine was a very persistent caller and caused me a lot of stress but I did get to the bottom of it.