NO SIGNAL

Since the 19th of March I have had no signal at home. I contacted the call centre on the 21st of March to report the problem and they confirme it can take 3 to 7 working days to resolve the query. After telling them that I only have signal if I am not at home, they tried to phone me 2 times. Needless to say they could not reach me as I do not have signal. I phoned them again on the 24th of March as we still do not have any signal and they confirmed again that somebody will contact me between 7 and 12 when I am at work and havr signal but I am still waiting and I still dont have any signal at home. What am I paying for if I cant use my phone from 2 in the afternoon until 7 the next morning when I get to work and then only I have signal. Tried to tell the call centre it must be the tower where I stay but they say they can not help only the technician that needs to call me can help....BUT the technicians can not get HOLD of me because I HAVE NO SIGNAL. Paying for something that I can not even use.....