bad service

Here I am writing complaint that I gave birth to baby boy on Sept 27th 2018, that is in hospital fee for Pediatrician I paid 2982.40. I sent this claim on October 5th then They responded over email and said that invoice has been received for processing and payment takes up to 30 days and it is subjected to available funds. I was thinking that payment is going to be made with in 30 days period. when I have called today(30/10/2018) to one plan to check about this claim, then they said this claim got rejected on October 10th and said baby was not added with in 30 days period but one plan never informed when it is got rejected on October 10th. They should have informed me as soon the invoice got rejected I would have added the baby with in 30 days period. 30 days grace period only completed just 2 days ago. I added the baby today(30/10/2018) once I heard that claim was rejected.