Hi there and welcome
Can you use a match please and use this to push it in as far as you can.
Can you then get it to click in using this?
put the sd card in and then push it down with a match as it will get it down further then you can with your hand
ok, can you put a vacuum cleaner over it to remove anything damaged inside then try again please
It is the locking mechanism that has faulted, it will have broken off inside or cracked
I am really sorry about this and you are going to have to return the camera to have the body replaced (as it is a part of the body. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.
if you need anything else please let me know
And please remember the service rating at the top of the page (the stars) then submit