Can’t mow my lawn because of wet and tall grass?

I have a yard that needs to be cut.Well several lawn people have came by and said they can’t cut it because it is to wet and there is a leak issue also the grass is to tall for it to use a regular lawn mower.How to fix this problem?Should I pay the $400 for the service because today someone said no one will do it because the equipment you need is more advance.Also we have a creek next to the grass back of house.Should we put a drainage?Im to scared to go back there because of snakes.so I want someone else to look at it.