Comcast business vs Xfinity confusion and poor service

After 20+ years with AT&T I decide to switch to Comcast. BIG MISTAKE. My business office is in my residence. I sign up for Comcast Business. The tech shows up & is ready to leave. What about my residential TV? I am informed for the first time that this is a separate company. So now I sign up for the Xfinity TV service. Now watching TV I keep getting error messages that I am not connected to Xfinity internet. No I am not, I am connected to Comcast Business Internet. Try fix the problem the support person suggests I switch from Comcast Business to Xfinity internet. I agree. I also need the Xfi wifi extenders as my house is on two floors. I have the option to pay $25 monthly to rent these wifi ext, or purchase them for $119. So I buy them. a few days later I receive bth the Xfinity modem & the Xfi extenders. I go to connect them. The modem only has 4 ethernet ports. My business needs 6. So now I tell the support person to cancel Xnifity internet, my businesses the priority & I will I've with the TV errors. They agree. 3 months go by. I call to ask for the return devices. I find out they never canceled as requested and have been charging me for both for 3 months. Now that will not accept the return of the Xfi box I purchased for $119. Still in an unopened sealed box. Comcast has stole $119 from me.