"Temporary" layoff and severance

5 of 6 (not the manager) salary employees were layed off after being given 2 weeks verbal notice. I have a contract with the company that requires 90 days written notice or payment in lieu of. There is a "just cause" clause that would void the 90 days. The layoff was billed as a temporary layoff with employees being called back in 2-3 months, depending on their skill set. A "Don't call us, we'll call you" verbal policy was announced. I have had several verbal disagreements with the manager and do not feel that she will ever call me back up. I was not asked to return my key, but we were told that the locks were going to be changed. Am I entitled to write a letter asking for my 90 days? I already filed for unemployment in MD, will that be a problem?