SCI*Stamps.com (Stamps.comAccount Support) the united states post office did not cancel the account richmond, Virginia

The csr handleing this account simply did not do their job and simply were reluctant to cancel the account when i asked them to. they continue to attempt to bill the account. that does not not exist.. and was never once used.. I did not find their services useful and canceled the accout Or thought i did, after calling support to try and cancel..Not finding a way to do so on their website.. Iwas originally told "ok, you have canceled your account"  and then continued to recieve bills. And any further contact only repeated "no you did not cancel your account"