Regus review: Duplicate billing and then charged late fees

Billed twice for October and then charged late fees on a bill that wasn't owed in the first place. It's pretty obvious from my billing statement that I was never presented with a correct invoice amount since my November 3rd bill. Late fees from a duplicate invoice in October followed month to month to month. In fact, a bill from October still shows unpaid from when I was billed twice in the same month! Regus screwed up and credited my November invoice not the duplicate invoice and this caused a late fee to issue from the duplicate invoice not being paid. The late fee then issued on every single invoice since their duplicate billing and improper crediting. I refuse to pay incorrect invoices and have asked for MONTHS to get this corrected. It has taken THREE MONTHS to be told that somehow I am responsible for paying incorrect invoices on time. WHAT?! Who pays incorrect invoices? There hasn't been a correct bill issued by Regus since November 3rd and then Regus turned around and paid the November 3rd invoice when they should have paid the duplicate bill from back in October. This is beyond ridiculous at this point. Customer service failed to respond for months and then when they did finally respond in emails, they blamed me for not paying what wasn't actually owed in the first place. To be told that I owe late fees for not paying incorrect invoices on time is truly astounding. November 30th bill shows a late fee from the duplicate bill in October. I don't owe this. Shouldn't have been billed twice in October.
December bill shows a late fee from the November bill being wrong and the duplicate bill from October still sitting out there. January bill shows a late fee from both December and November being wrong (and with the duplicate bill from October still there). Just a cycle of incorrect billing month after month after month and complete incompetence with credits and customer service.