I'm not sure if your being serious here or just messing around, but I'll give it one more shot to try and help.
If you found a modem and router combo that you are able to getting into your router settings than stick with that.
Now did you do all the steps or did you just change the Mac Address??
Once in router settings, all u need to do is change the last 2 digits, which sometimes is 2 numbers or a number or letter
After typing in the new digits, there should be a button to click saying "APPLY" or something like that.
When you click that Apply button you should see on the screen that the new MAC address is being loaded
At this time just unplug your modem, or if you have it plugged into a surge protector just turn the power button off and than on and you should see the modem lights all blinking and resetting
Now just wait, at this time your modem is powering up and on your screen you should be in router settings and the Mac should be loading
After a couple minutes , be patient , different hardware will require slightly different timing to reset, but once everything comes back on you should pick up a connection
Once you are reconnected to the Internet and you can see this by looking at the Internet icon usually on the bottom right of your monitor, than check to,see if your IP has changed, and you can see your IP right there in router settings or use
IPBurger.com or whatever IP site you like ,
Now at this point your IP should of changed, or you may not have an Internet connection, if you do not have an Internet connection than:
Turn the power off and on to the modem and do the same with the router, when they both power up than you should have a new IP with an Internet connection
Some routers like the netgear N600 all you need to do is change the Mac and click Apply and power on and off the modem and this is enough to change the IP,
Other routers you need to click apply after router settings and as soon as you click apply you can than power on and off the router and modem
If you do this correctly you will change your IP
What Router have you Purchased??