Bought Microsoft wireless mouse 3500 last month working fine, but since yesterday the right click is not working and sometimes left click does the right click functions. I have plug, unplug several times, uninstall and install intellipoint software, changes usb ports, but still the problem persists.
It sounds like your mouse is broken and you should be able to get a refund/replacement.
But before you do that there is a few things you can try to diagnose the problem.
Since the left click sometimes has the right click functions, I think the diagnosis is a driver problem.
The fix would be to update the driver, or use a different one that does work.
Call MS Tech Support They will help make sure you installed it correctly. If that fails, get it replaced, or ask for a refund.
These mice come with 90 tech support from day of 1st incident which would start when you contact Microsoft at the below number.
MS Hardware Support and Warranty Claims
Tech Support 1-800-936-5700 for MS Hardware