My Bluetooth device won't work

Hi everyone,
firstable sorry for my english.

I recently bought an ANKER BLUETOOTH KEYBOARD, and now the keyboard lose the key "E" (i mean this key stopped working) so, i removed the device from my BT list and then the device now won't pair anymore. the funny part is that if i press a key on the keyboard shows up on BT icon.

i removed 100 times

i delete the apple.bluetooth whatever name is...

i did everything i could...

is there a way to really reset the bluetooth devices complete. erasing all traces???
Best Regards!

Nefi Adonis