HTC phone locked after too many pattern unlock attempts and googlemail not worked- pls help me!

I gave my mum my HTC phone a couple of years ago. She thought the phone was inadvertently calling people so I put a pattern lock on it. She promptly forgot this and made ten attempts to unlock the phone! I have to enter my gmail and password but that is not working.
I also have as a last resort tried to do a factory reset but even that is not working.
Any ideas pls?
My mum went to a few phone shops but they couldn't help.

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