Hey Thabo - Do the following to access the recovery mode on the Mobicel Retro to be able to wipe user data and restore it to factory setting.
Pull out the battery and replace it again
Press and hold both Vol Down and Volume Up keys and, while the vol keys are held down, press and hold the power key for 5 seconds (or until you see the two white options - 1] Recovery Mode: Volume Up 2] Factory Mode: Volume Down
Short press the Volume Up and wait about 5 seconds - you will get a Green robot lying down with it bowels opened and the text: No Command
Short press the Power key - you will then get the Android System Recovery Menu NB: Scroll up & down using the Volume keys and make your selection using the Option/Home touch key
Scroll down to Wipe data/factory reset and then select it
Scroll down to Yes---delete all user data and then select it
Wait for the wiping to be completed...
Select 'Reboot now" to restart the system and you should be done.