Trying to find contacts associated with a particular job

@operator

Hello,

I am attempting to return all the jobs associated with a particular contact. I am attempting to search through the customers, here is the code (C# .NET 2.0):

               SearchMultiSelectField searchMult = new SearchMultiSelectField();
                List<RecordRef> lstRef = new List<RecordRef>();
                RecordRef rr = new RecordRef();
                rr.internalId = "7558";
                rr.type = RecordType.contact;
                rr.typeSpecified = true;

                lstRef.Add(rr);                               
               
                searchMult.searchValue = lstRef.ToArray();
                searchMult.@operator = SearchMultiSelectFieldOperator.anyOf;
                searchMult.operatorSpecified = true;
                ContactSearchBasic contactSearch = new ContactSearchBasic();
                contactSearch.internalId = searchMult;

                CustomerSearch custSearch = new CustomerSearch();
                custSearch.contactJoin = contactSearch;

                SearchResult sr = nsSvc.search(custSearch);

7558 is an internal ID of a contact that I have verified is associated with a job. Unfortunately the result doesn't find any matching records. What am I doing wrong?