Pleading for mercy to Satan and his demons not only places you in a position of weakness, it also alerts them to the fact that you have no options. It tells them that God is not with you. However, you should know that the devil never hears your cries for mercy, and has no capacity to respond. If you have reached your limit, and you desire to repent, then your only hope is the Lord God Almighty.
The Lord God Almighty El Shaddai