Internet Scams

Recently I had a phone call from someone claiming to be from the technical department of my current telco and was told that 'unfortunately we will have to shut your internet down'. As the caller was ringing from overseas I naturally thought that this was some type of scam and did not bother replying. Roughly every week since then I have had a similar phone call with me asking them for their name and phone number so I could ring my telco and verify that they were legitimate callers and not someone trying a scam. I was speaking to a friend about this and was told that he had roughly the same experience and abused the person who called just to find out later they were genuine and not from India where most of the scamming calls seem to originate. When are companies going to realise that if they decide to 'farm' out their calls to overseas countries then they run the risk of losing customers because of possible scams?