You do not say whose technical support called you so we can only speculate. I know of no reputable businesses that are cold calling to do technical service.
You can report this kind of thing to your local police, the Better Business Bureau (or equivalent in your city), the credit card company. It is not something anyone in this forum can help with nor does it sound like a Microsoft issue. There are
telephone scams like this that have been reported in various places around the world.
If you accepted remote assistance then the tech could remotely access your computer and use it as easily as you.
Colin Barnhorst Windows 7 Ultimate x64 on DIY with 6GB ram.