Even more Revise and Resubmit woes

Ok, this is about a completely separate ms-this time sent to an agency.

A few months back I was given a rejection notice from an agent's assistant, with extensive revision suggestions. Very helpful. She told me that if I chose to resubmit, just to remind her of it.

I zapped her a quick email just now asking if she would be interested in reading through the ms again-and she's gone. The agent has a new assistant.

Do I try to find the original assistant? Do I email the new one with a "hey I was invited to resubmit by -previous assistant- with email documentation of it all? I'm a bit confused...

So in the end, I contacted the previous assistant, who told me to email the new assistant with the old information. I did, and she asked to see the query-when I sent that, I got a form rejection.

God, sometimes all this just makes me so angry! But at least the first agent's revision suggestions were helpful.