I am receiving a volume of calls from this number. They divulged an old address of mine and this is perhaps because they are not actually Charter, but rather someone who has acquired Charter records and is trying to solicit credit card information from Charter patrons.
I have blocked this number and will report it to the proper authorities if they can find a workaround.
If you have Charter, pick up the phone and at the dial tone type *60 which takes you to the selective call service. Press 2 to add this number, wait for the confirmation, then press 6 to end the call. Blocks this number from calling you in the future. Unfortunately this shows up on my caller ID as Charter, which is probably against some law to do.