Keyboard has mind of its owm!

My keyboard won't respond to some of the letters I type at all. And if a letter does respond it always displays a different letter than I typed . And when I try to delete it keyboard won't respond. I tried switching keyboarrds through language and input in settings. No help. Turned off and on . No help. I can't type any ANYTHING! Only 2 months old. Walmart return policy is only 15 days. Really don't want to send it back to RCA and go without any device while waiting for replacement if possible. My only device. I'm disabled and homebound. It's the only thing that connects me to the outside world. REALLY NEED YOUR HELP!! Please and thank you!