Samsung

We have two Samsung Tablets in our household. All of a sudden we can't log in with our passwords on both the tablets as it keep on saying password incorrect. Even if you take the sim card out it keeps on asking for a password. On my tablet I managed to go in as a guest without asking for a password, but has run out of space and can't even save it to my memory card. My fiance took my tablet in to Samsung East Gate where they want to charge me R450.00 to reset my tablet (which means I loose everything I have on the tablet)