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Make sure the LOCK switch on the cards is not in the direction of the point of the arrowhead... that would 'write-lock' the card, and prevent files from being written to it. (I doubt that's the problem. But it's worth mention.)
Then... how large is the 'capacity' of the card(s) you have been trying? if too large, it might mean that even though formatted, they are too large for the cam to write to them.
This model of cam is rated to be able to use cards up to 64 GB in size, but there's a catch: it can only use cards of Class 10:
Class 10 only MicroSD memory card
is what the specifications say.
So check that the cards you are using are Class 10 cards, and you should be OK.
If that isn't it, there are these things to try:
Try removing the batteries, and leaving the camera on a (dry, non-humid, non-dusty) shelf for overnight. Then put the batteries back in and try the camera again.
Then try cleaning the terminals in the battery compartment, after removing the batteries, first by rubbing off with a fresh pencil eraser, then by wiping the terminals off with cotton swabs moistened in rubbing alcohol, then letting them dry off for 5+ minutes with the battery compartment door open, then try turning the camera On again.
Let me know how it goes, what you find out, and if needed, ask me more about Class 10 cards (at no additional charge.)