Unsatisfactory service

On Monday June 10th, Lines was installed and a splitter was installed on Friday June 14th. I was informed it would take 48 hours to be connected, but there has been no progress since then. Customer support is unresponsive and if you do manage to speak to someone, they make empty promises. This customer service is unsatisfactory because I rely on the internet for my job. Is there anyone competent who can help out?