My parents did that once when they were angry for some imagined reason, I hadn't rung them I think. I need to remind dd to call to say thank you but I haven't. I might not bother.
Don't bother. When the relationship isn't there, sometimes the best thing to do is just to move on, to be honest. I have. I've been married for 20 years. For 10 of them, I visited my MIL every weekend. When I visited, I always made sure we brought something with us: some groceries, small treats for her and other things that I thought would make her happy. She never thanked me for any of that. Never bothered with my son. When he was little, he'd only get £10 or so on his birthdays but only if he happened to be in her house when it was his birthday. Otherwise it was out of sight, out of mind.
She doesn't even know when my birthday is. Or, indeed, bothers with my husband's. 5 years ago, we moved house. She's never been to our new house because she doesn't give a sh**. So, I stopped visiting her too. I stopped reminding my husband to call her on her birthdays. I don't send her gifts, cards or money anymore, and I absolutely resolved not to set foot in her house ever again although I never stop my husband from visiting her and, in fact, taking my son with him to do the same.
It made things much easier for me as I no longer feel bad that she never bothers with us.
I do appreciate that it is harder for you because it's your parents rather than in-laws. I'd advise you not to cut ties completely but just don't bother with anything other than a superficial and reasonably civilised contact. You just can't have close relationships with some people and, unfortunately, sometimes even with your family.
Over the years, I learnt one thing: shitty parents usually don't make great grandparents. I don't suppose yours were amazing parents, who suddenly turned into inattentive grandparents?