Worst customer service we have ever experienced

Our experience with Iron Mountain just gets worse with every email. They have issues with their invoicing, with new systems which don't seem to work. Incompetent staff who have no idea what they are doing. We keep getting emails telling us our account is in arrears and when we query it, we are told it's a system error. We have now tried to withdraw documents and have been told our account is on hold due to invoices outstanding. Is this another system error?? It has now been a week of trying to sort this out and not a single staff member gets back to us. If this is what their service levels look like, then I cannot imagine how safe our confidential documents are being kept.