Beamer wrote:
I did this with an energy supplier who, despite being politely and firmly requested to stop calling me persisted in ringing my mobile.
Once they called me when I was in Spain, thereby costing me money to take their sales call.
I eventually wrote to the chief exec of the company advising him that my terms and conditions had changed and that any permission, express or implied, for them to call me was hereby withdrawn and that from here on in any calls would invoke a charge of £150 for my time. I also said that acceptance of the terms would be signified by them making a call to my mobile and no further correspondence would be necessary. I also said that call records logged on a mobile phone would be the only proof needed of a call.
Guess what? They stopped calling!
Like it. Got a similar letter for folks who threaten call at door. eg ,had debt collctor letters for some person unknown at my address. Phone calls -ignored, letters ignored. Then they threatened to send a caller. Sent letter ,recorded- gues what -it all stopped .