Battery not charging

When the charging system is confused (such as when the battery has been run too low) it can sometimes be unable to do a regular charge cycle. In the vast majority of cases, an SMC reset solves that problem.

Your Mac can usually trickle-charge, at a much lower rate, if you simply connect it to power and leave it, at least overnight.

In some cases an SMC reset after overnight charging (while nominally OFF) can sometimes allow your Mac to charge again. It costs nothing to try.

You should get the MacBook Pro checked and the battery serviced.

Have a look at the Mac Repair Service page for all the options to contact the official Apple Support or visit an Authorised Apple Service Provider next to your place:

Mac Repair and Service - Apple Support