Ques. Today I was searching for a contact in my Windows phone, suddenly I came across a huge number of contacts starting with the word 'SPAM'. I did never receive any call from these numbers and also never called them. If I try to delete these numbers then I'll have to spend my holidays to complete this task. But still, it will keep increasing my contact list. I never expected such type of bugs from an experienced company like Microsoft. A few days ago there was a bug in WhatsApp but in a new version everything seemeed to be perfect. My perception for Windows Phone drastically changed when the update for WhatsApp was released,but again things are going wrong and according to me Windows phones are going back to the time when it was just a mere Mp3 player.
Ans. Here is the tuorial on how to hide these contacts: http://www.truecaller.com/pdf/how-to-hide-spam-numbers-on-windows-phone.pdf