I wouldn't hold out much hope of being removed from some of the databases. The reason being that your (our) details have been sold/given/stolen and the miscreant chancers of the planet have them and they work their way through them with computer calls and manual calls. Their fail rate must be huge, but obviously enough people 'bite' for it to be worth their while. They operate outside of the law for the most part and call from offshore centres to circumvent the TPS in the UK, for example. You might also find that some of them have been allowed to contact you by your supplier, and your consent is hidden in the depths of the contract that you signed. It's a huge problem and blights the private lives of too many people. I feel most sympathy for the elderly who are bombarded with these wasteful calls on their home phone.
SHJ