For the last few days I have been plagued by these calls. I answer the phone and there is nobody there. I assumed it was some crank having a laugh but I'm told it is a byproduct of this accursed telephone marketing. The people at the call centres don't take all the calls generated by the automated dialers so some end up as these "silent calls". There is a number you can call for the Silent Call Register, similar to the Telephone Preference Service. I have now done both these but it will take a while to have an effect.
Most of these calls register as number witheld but two of them have come up with numbers so I suppose I can report them as malicious calls.
Most of these calls register as number witheld but two of them have come up with numbers so I suppose I can report them as malicious calls.