siblings missed pension deadline, now they're trying to get the money
i'm not sure if this is where i should be posting, but i've seen posts of a similar nature here..
long story short: my dad died just under 2 years ago now, we received his pension march 8 2026, only after my older sister threatened legal action toward the company as they began to ignore our emails and took months to send the money. now (may, 2026) 2 months later, i and other siblings have received a letter saying we need to send the money back as "not all siblings received notice" to put in for the money.
firstly i have screenshots (we're all in a gc) of every sibling, who wished to receive the money, sending their details to my older brother who then passed the details over to the pension company.
we were all given plenty of time to meet the deadline. my sister missed it, so now she's gone to the company and said she never received notice to be able to adhere to the deadline, which is false.
what i'm wondering is, without concrete proof, how is the company allowed to operate like this? she missed the deadline, so she missed out on the payment... no? this is how we were told it would operate. we were all warned, miss the deadline and the money will be split between the siblings who do put in for it. now my sister is bitter and lying.
is the company allowed to ask for the money back without proof of said sibling not having access to her email?
any advice? what can i do?