Sanral VPC - PATHETIC!

My husband and I religiously pay our bills on a weekly basis via EFT, this despite Sanral inefficiencies and the exceptionally poor manner in which you conduct your business. I have emailed you numerous times since 2014 and always receive the standard 'enquiry record notification' email, but after that, the query is just 'closed' or not a further word heard from you. Since July 2014, instead of waiting for your invoices to arrive via post (like we had been doing since e-tolls were implemented), we began noting our travel on a daily basis and every Sunday, we calculate the total due via the e-toll calculator and make an EFT into the Sanral account. Payment is made within 7 days of first travel, so as not to incur any additional penalties or VPC admin charges. If you were actually doing your work, the balances due on both of our accounts as a result, would be zero! Instead, we are now sitting at R15,800.00 and R 1,800.00 respectively. Simple accounting works like this: once payment is received, the entire total debited to the account, is credited!! Instead, you choose to ignore our weekly payments, take our money and continue to keep debiting our accounts? Pls explain???