Ask the senator that has helped you in the past if (s)he will do an inquirey for you. If the senator faxed something to them and they say they did not get it, the senator needs to find out why. Engage your senator and encourage him to find out for you what is happening. That is really all that you can do. When you send things to them make sure that they have to sign for them so that you have proof that they got them.
18 months is extreme for any consulate.