Suellda
Courts have ruled that employers / administrators must make a good faith effort to provide eligible participants the COBRA notices, which means the notice must be sent in reasonable belief that the notice will actually get to you.
The notice should have been sent several ways, esp. in a
divorce situation where the employee may have un-enrolled the dependents and spouse for whatever purposes and will try to impede the COBRA rights of the estranged partner.
Write the to health plan administrator and give them your correct address and tell them they have to rectify the lack of notice. Did you get a COBRA notice when your ex first joined the company?
You can also try and get your own
COBRA alternative medical plan