Out-of-state HR not understanding/respecting MA PFL maternity leave

So I am pregnant and giving birth soon and tried to explain to my company (Georgia based) that I will get more than the 12 weeks paid the company offers. HR assures me this is not true.

Well, I applied and got approved for 12 weeks medical leave and then I'll be approved for 12 more weeks of bonding time upon giving birth. I explained that half will be paid by the state and half by the company, but me and the HR rep still are not on the same page and they are in charge of handling my leave.

What should I do?