Hi,I am Sandy and I look forward to help you today with the best answer possible.
I'm sorry about the issue.
Gmail/Microsoft/Google never ever call a user from their end.
Only hacker/spammer make such call.
I suggest you to please ignore this call. However, to be on safer side, it is always recommended to change your gmail account password ***** in 5-6 months.
Also, I want to inform you that this is only time charge and no monthly charge.
However, if you still need a phone call, I can call you using "skype".
I will work with you until you're satisfied with my answer.
Please reply back to me by clicking "Reply to Expert" and type your queries/result.