I really, really need some help here.

We have a service provider that is utter shit. Due to their shittyness we have a server to which our customers point their domains and then we forward the request to our shitty provider. This worked well until our provider blocked our server's IP.

They can't come up with a reasonable explanation as to why it's happening, and even though they've whitelisted our IP it keeps happening. I've tried changing the server's IP, but it takes 5 minutes and we're blocked again. Probably some traffic that they deem fishy.

Does anyone have any good or bad idea on how to work around this fuckery? The server at our provider is running PHP, so I'm thinking if I can set up some sketchy tunnel or something, but even then it might be caught on a lower level.

I'm really, really grateful for any ideas or advice. Even of the shitty kind.