Was our breaking the fast wrong and do we have to make up the 30th day of Ramadan?

Praise be to Allah.

You do not have to make up the 30th day, because Ramadan was 29 days, based on the fact that the shar’i moon sighting was confirmed and nearly 10 people testified to that, as was mentioned by Shaykh Saalih ibn Muhammad al-Lahaydaan, the head of the Higher Judiciary Council (may Allah preserve him). 

If anyone was outside the Kingdom and relied on its moon sighting, then his breaking of the fast is valid and he does not have to do anything further. 

And Allah knows best.