Sadly, there is a point when its just smarter to replace the charger, this is one of the cases. ;-{
You could try getting some glue where the pin fits in. I’ve had mixed success.
Make sure you get a '''REAL''' Apple unit as many of the Amazon or eBay units are knockoffs which can damage your system!
* [https://lifehacker.com/dont-replace-your-macbook-charger-with-a-cheap-knockoff-1825605569|Don't Replace Your MacBook Charger With a Cheap Knockoff]
* [https://beetstech.com/blog/oem-magsafe-chargers-vs-counterfeits-teardown-for-truth|OEM MagSafe Chargers vs Cheap Imposters: Teardown for Truth]
* [http://www.righto.com/2016/09/why-you-shouldnt-use-cheap-macbook.html|Lacking safety features, cheap MacBook chargers create big sparks]
* [https://www.youtube.com/watch?v=DrxAuhrrLU4|FAKE Magsafe MacBook Chargers on eBay - Watch before buying a Mac Charger]
'''The real MacCoy!''' [https://www.apple.com/us/search/MagSafe+Power+Adapter?src=globalnav|Apple.Com - MagSafe Power Adapters]