Residential Finance Corperation RFC my $6000 escrow holdback fund been stolen by the company Columbus Ohio

I got a loan last September from a loan company called 'Residential Finance Inc' (RFC loan # 1307463787) on the house I bought from bank owned which had some damages. I got $8000 credit from the seller bank to cover the cost of repair, but the load company hold $6000 of it as holdback escrow fund until we fix it. Now we have all the damages fixed and want to get the escrow fund back, but found out that Residential Finance is bankrupt now and my loan been transfer to Dovenmuehle (loan # 1433913900) after Residential Finance bankrupt and from Dovenmuehle to currently Seneca Mortgage Service (loan #5098105) now, but the $6000 escrow holdback fund is missing from the loan.
I contacted Seneca Mortgate Service for it and they spent 2 months did the research and told me that Dovenmuehle didn't transfer the $6000 to them and even Dovenmuehle didn't get it when they received my loan.
I contacted PMAC lending which is now occupied the Residential Finance office and they said they didn't acquire all the loan from Residential Finance and they didn't acquire my loan.

I contacted my title company -- ServiceLink asking about the escrow fund and Eric Fisher my service officer said that RFC requested a check of $6000 and cashed it around 9/30/2013 right after I closed my loan and they didn't put it into my loan account even on the check it clearly marked

'TO THE ORDER OF -- RESIDENTIAL FINANCE CORPORATION / LOAN # 1307463787

                              1 EASTON OVAL, SUITE 400

                              COLUMBUS, OH 43219

                         RE: XIUJUAN PANG (((redacted))), BEAVERTON, OR 97007

                               HOLDBACK FOR REPAIRS

Now I think I need some legal professional's help to get my money back.

Sincerely,

(Susan)Xiujuan Pang

(((redacted)))

BEAVERTON 

OR 97007

503-***-5030