Hello Navythe_slayer,
To begin with, the old servers that were not updated for a long time (Op-Skyblock, OP-Prison, Prison, Skywars) went down due to the fact that there were several bugs causing big damage to the whole network. We can not really explain to you what exactly happened to these gamemodes but since it was almost impossible to play on them and it would take much time to fix all the bugs, the owners decided that temporarily closing them is the best solution. All bugs will get fixed as soon as the servers get back online.
Secondly, you should not worry about your money. You will receive back your rank whenever the server comes back online. If for some reason you don't get it, submit a payment related ticket.
Kind regards,
HakunaMyFapa