Saveologytech Sold me a stolen modem Internet

 I thought they were affiliated with Comcast, but they aren't. I bought the modem online through saveology (with the supposed initial Comcast installation) for $200 with a $180 mail-in rebate (which I received), so the modem was only $20. Comcast kept trying to collect the rental fees & later claimed that I didn't return their equipment. Collections agencies even started calling. I used the modem two years later with Comcast & now they're telling me the mac address shows that is their equipment. So saveology sold me a bunk modem (stolen or never returned)! They're a scam company.