besides, if ibill truly had those errors, they should be sending out detailed statements including dates of those chargebacks that had not been collected, names or subscription numbers of members who charged back - and then you could compare them against the statements from that period and see if you had already been charged.

and if they couldn't provide detailed info, i would consider that their claim is fiction or they are too fucked up to be sure that those were errors and should be taken from your money.