HiĀ diffender,
Yes right ! As the word says, Buy refferal means, it stays within your account with an unlimited days without any expiration of it, Rent means it stays with 30 days by default where you can customize it and take actions of your Rent refferals such as days extension, recycling, so that if that refferal is inactive you can replace it with another one. In Buy refferal, it stays forever, so you have only 1 option which is delete that's it, both have there own advantage & disadvantage, it depends on how you control them and move ahead with good mixture of both. In Buy refferal you can get good amount of Commissions if they buy any ad packages you get some % of it depends on your memberships, and if they upgrade any memberships, you will also get that fix $ as a bonus.
About the KYC part is difficult to guide through forum, but if it's already showing KYC process, kindly check if you are able to withdraw it? what does it showing there, try it once you reach minimum 1$ as a minimum cashout amount.
For this, i would suggest you to reach a awesome Support team directly for a personal check/guidance--> https://adbuxpro.com/support