I know this doesn't help but I think it really sucks that DIRECTV charges the installer because a homeowner doesn't have a landline phone.
Is the installer actually "charged" money or does "chargeback" mean the installer gets some kind of bad comment written up about the install job or something like that ?
There should be something on the DIRECTV contract that says something like -
The customer hereby states they do not have a landline phone in their home and this is not the installers fault. and the customer signs and dates right next to the statement. The customer not having a landline phone has nothing to do with the installer.