Need information regarding smm panels

Hi there, I've been using smm reseller panels for last few years but i want to dig deep and want to know how they work? Surely they don't have so many accounts their panels are connected to some other providers because there are few panels which are providing similar services at different pricing so i want to know who provide the reseller panels the services? who are these providers and how can we buy services directly from them? if you are that service provider then please leave your contact details and i will contact you.Thanks