I asked the owners of RSBOTVPS why I can't log into Runescape Account Management on Runescape.com and they answered me with this:
We have investigated this thoroughly and unfortunately the results were much worse than we thought. Jagex has taken the offensive and appealed to our provider to place a mass block on VPS's using the NeXus client. Any service using this client will be terminated. We quickly switched to a different host and have lowered prices to help any current customers that were effected. We are also providing extra discounts to any customer that already has a current VPS. Our previous provider was BurstNET, which sold many VPS's even to people who did not buy through our site. We are sure the botting community in general will be significantly effected by this, not just RSBotVPS customers. Unfortunately, we cannot provide any refunds for current orders as BurstNET will not refund us either. We are going to try and eat the losses so our customers do not have to. An email was sent out to all customers with an active service with a promotion code which will provide a further discount for a new purchase.
We apologize for this inconvenience and enjoy you as a customer. We hope our business together can be continued.
So I am guessing Burst can't get into Account Management, but does anyone know a VPS which can?