I once moved into a duplex and Spectrum's precursor told me I already had service. After 8 hours on the phone I talked to someone in customer service who told me "I know the problem you have, I know how to fix it. I can 100% fix it. You are welcome to stay on the phone, but it will take more than 6 hours for me to create an account for you". So in the end it took days to open a new account.

When I moved they someone opened a second account in my name and kept billing me for the original account.