no I wouldn't buy a house on the telephone! But this is hardly the same thing... There are some purchases I do in person or in writing and there are some like simple broadband and TV I will do over the phone. I do this for the sake of speed, if I write in then what could take a few days could take 2 or more weeks. I won't be buying things by post but I will be backing up my telephone conversations with proof and asking for written quotations before I go ahead and buy.
I also happen to have the most comprehensive records any person can have with 3 filing cabinets, a hard disk packed full of scans of documents, copies of letters etc with a backup hard drive... that is how much I value records. I take notes with every conversation, but my issue is that a company can choose to ignore my notes and say it is their word against mine, hence why I shall now be taking extra measures. Also I don't visit this site often, so apologies if I have not seen time and time again your advice on written correspondence.