[mothered]

I cannot just purchase a router, I'd have to purchase an entire new modem which would set me back €200, something I'd rather avoid.

That's what I meant, your AP- modem/router whatever gateway you access the net.

I'm at a loss as to why your ISP cannot handle It on their end. The traffic (DDoS) Is obviously going through them, yet they're refusing to take responsibility and provide you the service that you signed up for. I'm sure you didn't agree to a DDoS as part of your monthly quota. I'd be speaking to senior management and "demand" they wake up to themselves and get their act together.