I think the problem is caused by the fact that the port is rectangular and not the shape of a standard micro USB port, this allows you to attempt to plug in a standard micro USB cable in both ways round, it will fit perfectly the right way round or if you force it in the wrong way round you will break the connector tab in the port.
This is my charging cable which you can see has a rectangular plug (DJI plug), very similar to an original DJI control cable, with a standard USB A on the other end.
And this shows the rectangular DJI plug, which could also be plugged in the wrong way round, but due to fact it looks like an original DJI plug it is obvious which way to plug it in.
This is my control cable which has a DJI plug on one end and a standard micro USB plug on the other, the next photo is a close up of the two plugs
I don’t have an issue with mine but it is useful to know the parts are available and it ia relatively easy fix if need be. Thanks Dave for finding the parts on eBay UK.