My father passed away. Is my mother elligible for any of his benefits?

From 'life alert'
Gale (844-669-2557)
Yes, you would just contact Customer Service and return the system - we would pro-rate and refund remaining months on the plan

Is there a contract not allowing it? If you said that you want to cancel, and they are not allowing it, then you shouldn't have to pay for it. I'd contact a lawyer and explain the situation, because they can't force a service that you no longer require.