If someone told me I absolutely had to get rid of my firewall I would absolutely get rid of them.
Who has told you this, who is they ?
What is your ISP (Internet Service Provider), who you pay your money to to connect ?
They can't protect your system without you having their firewall program installed on YOUR system, it can't possibly protect YOUR system if the software/firewall protection is at the Server/ISP end.
So does your ISP provide you with a software firewall (they might not have called it that, security package) to install on your system ?