Need Help

Hi Guyes i already matched in a residency position through AUA match, my program is 6 ys program and offers 2 years general surgery in the start (through NRMP)unfortunately.. i am IMG and will not be able to catch the NRMP, however i will be able to catch the scramle, as ECFMG did not verify my situation on time.. so i may not be able to get the first 2 ys of surgery in the same program if i got these 2 ys in another accredited program through the NRMP scramble?.. is there a guarantee that i will have my PGY3 position in the urology program i matched?AUA web site says that the match is considered like a contract between the applicant and the program (is that true?),, however i am still anxious and concerned that any change happens, making me take 2 ys G surgery with no aim.... can i do any thing more? also i am concerned that situation become uncomfortable to the staff and the resident there???all advices will be appreciated