MTN no signal, no service...

I'm not the type of guy that complains, or bad mouth people or companies. But MTN is really pushing me. They installed a repeater at my property 3 years ago. The installer said the repeater isn't the correct one, as they are waiting for a shipment of the correct one, he said they'll replace it as soon as the right one arrives. Nothing happened since then and I struggled along with terrible signal reception. The last few months there is next to none signal. I logged a new fault. It's been weeks now. They've been here to test. The guy that did the test had to use vodacom to phone his supervisor. Then after a while the signal came back and he used MTN, exactly what happens everyday. After that the signal appeared to be slightly, very slightly better, but the data was worse. I've been phoning MTN coverage weekly and sometimes daily, they just say the technician will phone you, he did phone once, he knew exactly where I'm at and described my home, but didn't come. When I phone him he rejects the call. I have 80gb of data that I can't use. I need to take my router out and drive somewhere to have reception. Am I the only one that's binded by contact, even though I don't get the service I'm paying for?