US Immigration from Mozambique

I checked the status for the i-129f petition here https://egov.uscis.gov/ & the below message came up. Does anyone know what this means?

Does anyone know how accurate Track My Visa Now is?

Does anyone know what happens when your packet gets rejected due to a payment not going through?

1. Do they scan the visa packet into the system if your payment is rejected?

2. Do they mail the packet back to you?

I just submitted our Visa Packet & in our proof of evidence I have a text from my fiance where he refers to me as his wife. I also have him in my phone as Hubby can they deny our petition because of that? They are just nicknames!

My fianc overstayed his visa in another country (South Africa) when we vacationed together by a matter of hours. They prohibited him from visiting South Africa for one year and stamped it in his visa. It has been over a year.

My fianc is from Mozambique and his US Embassy interview needs to be in South Africa.

My question is, can they deny his visa because of this? Is there anything he can do to prepare for the interview?