Horrible customer service

I'm very frustrated. I'm unable to connect to the Internet, I made a payment for my account on the 1st, and they decided to cut off my connection , reason being my account is in arrears. What's frustrating me the most is that I've never missed a payment.

I sent countless proof of payment, but still, I'm not getting assisted. When I call I'm told to wait for billing department they don't respond to my mails or call me back.