If you can find their web site, get a customer service address other than the billing return address. Billing is clearly oblivious, and needs someone higher up leaning on them.
Then, return the bills with a letter, posted either registered or certified/return receipt (record of delivery), explaining in painfully clear terms that they need to correct this error within 30 days, and requiring written confirmation of the corrective action.
Be prepared to elevate this if the bills continue, or their solution is unsatisfactory.
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