Worst customer service ever!!!

In the beginning RSAWEB was great, no issues at all. Then last month I realize my internet isn't working. I investigate and find out that the debit order didn't go off, so I look for emails from RSAWEB that I might have missed to inform me of this. Nothing. So they actually went and suspended my account without any communication to me! Tried the chat feature on their site to get information, they say mail accounts department. I mail accounts a bunch of times, no response. Not even a ticket saying they'll get back to me. So I pay the outstanding amount and the next evening I get the first response from them since my account was suspended and it's not a message saying thank you we received your payment and your service will be reinstated. No, it's a threat of legal action against me if I don't pay the money I've already payed! I'm totally speechless that any company, let alone a well known company could care so little about their customers, that they would treat a customer like total dog**** for accidentally missing one single payment in the history of our relationship!