technitians sate its to expensive to put booster

I am a cellc customer for long no.i stay in erasmia where a service is poor when getting a call we need to go outside to look for signal we cant even use our Internet because of the service we had people sent to us to see whats the problem and received feedback stating that they could not assist us due to a booster is to expensive.We as customers has the right to have signal for we pay for it but they are not willing to help us with our problem they don't see the need to help their customers.I even offered to pay half the amount of the booster just to get better signal but they still declined the offer we see it as not willing to keep customers and bad service if someone can please assist us with the problem