Unfortunately, you have no other options left as it is mandatory that the sponsor should have at least QR10,000 basic salary, and not combined. The reason you got rejected is because the captain believed your family can't live a "comfortable" life with only QR10,000 combined, and thus your child might suffer in the end. That interview is your last hope. If you want to use other method, it would cost you your 1 month salary combined to pay those who provide these services.
Unfortunately, you have no other options left as it is mandatory that the sponsor should have at least QR10,000 basic salary, and not combined. The reason you got rejected is because the captain believed your family can't live a "comfortable" life with only QR10,000 combined, and thus your child might suffer in the end. That interview is your last hope. If you want to use other method, it would cost you your 1 month salary combined to pay those who provide these services.
Goodluck!