This company has the worst customer service I have...

This company has the worst customer service I have ever experienced.
Had an error message and kept "losing a line" and having to restart. Couldn't process payments unless we restarted. Tried to get a hold of technical support and waited on hold for 1 1/2 hours to be transferred to a call center in the states. They couldn't help me and took a message. Haven't heard from anyone. Sent an email as well. Still haven't heard back from anyone. It has been over two weeks and no one has returned my call.
I sent an email requesting to cancel my service - surprise, didn't get a phone call or email. Finally got a hold of someone in sales who said they would have someone return my call. Still haven't received a call (it has been two days).