Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? need help with leaking 4 acre pond

i dont know if this is placed in the right place or not but ill try to explain whats been going on and maybe one of you guys will be able to help me out
my dad built a pond about 15 years ago that when filled is about 4.5 acres maybe 5 anyway it will fill if we have a rainy winter or spring but will quickly go back down to where it currently sits at about 2.5 acres, so we know the leak is around where it always goes down to. if it fills up it will quickly go back down then stay at about that for the rest of the year even through no rain, it holds good. what my question is do you guys know if theres any business who will try to fix leaking ponds? im in the southwest TN north ms area. btw the pond has great watershed and my dad for the first 8yrs said maybe itll settle and fill but its not going to fill we even have a well that we can run into it but it would cost a fortune to try to run the well all the time to keep it full. anyway im sorry if this is placed in the wrong spot ive just completely given up almost on the pond every living up to its potential and am willing to do pretty much anything. thank you for your time and help.