I would like to know renewal fees of Premium Hosting plans after I bought it first time before.
The prices for iFastNet’s hosting can be found on their website. If they say $3.99 per month, it means $3.99 per month.
iFastNet is not some scammy bait and switch company, where they say “$3.99 per month*, *but only for the first month if you pay for 5 years in advance, $9.99 per month otherwise”.
But like @OxyDac said, if you want to know more about iFastNet’s pricing, you should ask iFastNet.