Issue with title

Hey Kennedy, We finally received one of the dreaded "title requirement" letters. Never had to deal with this before. There are several pages with various issues on two of our sections. As far as I can understand one part is whether our grandpa gave surface rights instead of actual mineral rights to his son.. our uncle. Our uncle in turn passed the mineral rights to us. The other part deals with the river moving and we are either gaining or losing acres. They even talk about getting a survey. They won't return our calls so we can understand what they are talking about... in plain English. If we can't figure this out ourselves, do you suggest a lawyer or landsman's help. Or should they be responsible for helping us. Thanks, your advice is really appreciated.