Very poor service and no customer care

Since we installed the line *** wen have not received any quality customer care- the day they were suppose to install they sent message that they would come-it took 3days for them to attend to us. Since installation it has never worked we can't receive and make calls. We where told it's working by the field worker after his installation and it's nearly the end of the month and they will expect to bill us but have failed to provide the service of having a landline.