Hello' Reset the Mobicel tablet to factory default and if that does not fix then take it back to your retailer for warranty coverage. You can follow the instructions here http://www.satechhelp.co.za/10994/Mobicel-Cherry-Firmware-Download-Flashing-Tutorial if you are out of warranty.
NOTE:We can flash the device for you remotely (over the internet) for R100 If you are not comfortable flashing the device yourself. Contact us from here