Frustrated mother.

Booked flight tickets for myself and 8 months son on flight site, They confirmed the booking only to find out when i got to the airport that my son couldn't board because there was a maximum number of infants on the plane and it said so when Flight site confirmed the booking but i get they didn't read that part. I couldn't board my flight and leave my child behind, i had to make other arrangement to travel from Eastern Cape to Gauteng with a child which took us 12 full hour. I missed work the following day because of that. Coming to my refund they told me it would take 6-8 weeks for the account to reflect in my account after a lot of emails to Flight sight the lady responding was just plain rude. The 6-8 weeks passed then she tells me the refund will be done once the airline refunds them of which she cannot say when. This is seriously frustrating as i paid a lot of money for those tickets and it can go a long way with my responsibilities at the moment.