Ambit 250 Infinite wont go online

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My modem turn down a while a go and since then i have tried every new mac address but no luck. My friend said to me that i need to get a mac address from a different area i dont know if this will work. I live in Huddersfield. To add a mac address i use the ambit config tool and the box i tick is set new mac address and thats it i dont tick any other box. I dont understand why it wont work when i put a mac in it takes me to the broadband activation page.
Does anyone have any idea what i can do to get online as i have tried different macs such as 00:d0 and 00:02 but still no luck. Or shall i try using the Haxorware software but the thing with that is that i dont know anything about that.