lindsaylogo.jpgLindsay Lohan continued her partying ways last night, through early this morning, at new hotspot Las Palmas ... and her father Michael Lohan has had enough.

Michael's attorney Lisa Bloom had sent a letter to Lindsay's camp ... requesting a sit down meeting with Dina, Lindsay and Shawn Chapman Holley, Lindsay's lawyer to discuss how to get Lindsay into rehab. Yesterday was the deadline for them to respond, and we're told the request was ignored.

Lisa Bloom, Michael's attorney, tells X17online exclusively,

    "Lindsay won't agree to go voluntarily to rehab. Michael and I did meet to discuss the best strategies for Lindsay. Right now, all options remain open. His heart is broken. As any father with an adult child who is doing poorly, this is heartbreaking to him."

Yesterday afternoon, X17 photographers caught Lindsay arriving at Right On Programs for her DUI-related classes. Both Dina and Lindsay remain tight-lipped when asked about meeting with Lindsay's dad. However sources tell us that with Bloom's help, Michael will be pursuing "legal remedies."

As for Lindsay attending her DUI classes, Bloom tells X17online, "That's a good start."

Shawn Chapman Holley has not responded to our requests for comment.