The language of the statute (47 USC 227) does *NOT* support that interpretation. It gives a free pass if the _caller_ has a "prior business relationship" with the party being called. There is nothing to indicate that the party with the prior business relationship can "delegate" that right to a third party.
See:
Particularly sections (a) (3) (B), and (a) (4) (B)
Consider a small-claims lawsuit for 'statutory damages' ($500) under
47 USC 227.File a formal complaint with the Federal *TRADE* Commission, for violation of the 'telemarketing rule".
Get on the federal "Do Not Call" list, if you're not there already.
The FTC rules make it clear that 3rd-party telemarketing agencies have to scrub against that list -- even if their client is 'exempt' from regulation.
Dunno about Bell South, but SBC -- who is *really* egregious with their telemarketing --_will_ flag a customer account for "do not call for marketing purposes", upon request.
I betcha Bell South will too. The law *requires* that companies maintain their _own_ internal Do not call list -- for *anyone* who has expressly requested that "that company" not call them. The 'prior business relation- ship' exemption does *not* trump the company-maintained 'do not call' list for marketing calls.
Note: When requesting (demanding) addition to the company DNC list, the companies are prone to tell you that it will take some period of time before that request becomes effective. Reply that the only delay sanctioned by law is for a number entered on the *NATIONAL* Do Not Call registry. that there is *NO* provision in law for any delay in implementing a company-specific "do not call" request. For a telco, require that they put in the account 'notes' that "customer has directed that his number be put on the company-maintained do-not-call list, and that therefore, in compliance with federal statute, all telemarketing calls cease IMMEDIATELY."
The telco _is_ "responsible" (as in 'legally liable') for the actions of any 'agent' or contract marketing service that violates the law. This opens the door for small-claims action against *both* the actual telemarketer, and the telco. subpoenaing the records for when _anyone_ "requested" addition to the company-maintained do-not-call list, when the add was _actually_ made, and the date/time of the last call each such number, does wonders for showing 'knowing and wilful' violation --- allowing for treble damages to be collected.