What is the ruling on the remaining amount in an agreement between two people if one of the parties breaches the agreement?

"The contract is the law between the contracting parties." If one agrees with a person to explain a program in thirty hours, then he is entitled to the full wage upon completion. If it falls short, he is entitled to the amount he has worked. If communication about the lessons is considered part of the hours by mutual agreement of both parties, there is no harm in counting it. There is no obligation to respond to requests outside the scope of the explanation. The remaining duration must be completed to be entitled to the full wage; otherwise, the worker receives only for what he has performed, based on the saying of Ibn Asim al-Maliki: "And for the worker is a full wage if completed, or according to what he has worked." So, if you complete the duration, including the accounted communication, you are entitled to the full wage; otherwise, you receive according to what you have performed.