Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I cannot help you by sending a code.
But there may be ways to get into your account, eventually, by my advice.
First: What Windows version is on your laptop, please? ways of recovering access depend upon that.
Second: Did the repairer have access to your laptop's Windows login? if so, they have a note of it. Calling them, if there is a chance of that, might seem embarrassing but has a strong chance of solving the problem directly and simply.
Call the provider of servicing to your laptop! they are responsible for their repair not working.