just got called by pre recorded message saying it's a public service announcement and it's one of those get debt free companies, message is from one of those computer diallers abroad probably pakistan so no human to abuse, no number to make nuissance calls back ive been registered with the preferential phone service[free] for quite a while now and have just joined another service to reduce silent and multi dialler calls ,the service is free but they do try and flog you a device to cut out 100% of these calls, to register just ring 08704443969