My son is 7 will be 8 in 5 months. He pees himself daily at home or school.

He does not seem to have a problem at night as long as i cut off his drinking in time for him to empty his bladder before bedtime. He says that he pees himself on purpose and that it doesn’tt bother him to be wet or that he is wet. He says that he goes in his pants just because he doesnt want to go to the bathroom. He does this whether he is doing something fun or classroom work. I’ve punished him, spanked him and he still doesn’t care. He does this constantly. He doesn’t even care enough to change. He just walks around wet until he dries naturally. He says this is not an urgent need and the he knows what he is doing and that sometimes it happens because he has tried to hold his bladder too long. Please help me!!!!