Our printer wont print out papers because it says its low on ink but we've bought ink and put it in, but it still wont print

Have you tried printing a test page from the printer itself.
There must be a menu on the printer through which you can print a test page or alignment page.

If it does print through that then it means that the printer is fine and there is some software glitch in the computer which needs to be fixed. But if in case it does not print anything at all through that as well then it means that there is something wrong with the hardware of the printer and needs to be taken care by Epson itself.