Had a number of silent calls from this number. Just now they called again and I got a woman with a strong Manchester accent who told me that the company name was 'Versatile'. In the background I heard typical 'call center' noise. I said I'd never heard of the company. She said that the company did exist and was based in Manchester. I told her I'd guessed that from the accent. She acknowleded that she had a Manchester accent. She said that they were regulated by the Ministry of Justice and the National Credit Database had shown that I was owed money from a credit agreement I had taken out. I said "Please stop calling me. Please remove my contact details from your system. If you or anyone from this number calls me again I WILL contact the Information commissioner, I WILL get you fined." then hung up.
The number they called has been registered with the Telephone Preference Service for well over a decade. I have made a complaint via TPS./
It seems that quite a few people are getting such calls and calls for different reasons.
ETA: Had an email from TPS yesterday. They have been unable to make contact with Versatile, they can't find any contact details. They have parked the case.