So, to answer people's comments: I'm not really going to change numbers, because I've already changed my number like 4 times for unrelated reasons, and I'm tired of changing it. I don't have a contract phone, and blocking numbers through the phone company is more hassle than it's worth, and probably wouldn't work anyway. I have no smartphone, so I can't just get an app. Not gonna take legal action against them because this is not a sue happy country. I have already told them not to call me, many many times (would be stupid not to have tried that already). After six months of two or three calls from them a day, ignoring them is not as easy as it sounds. There is no "do not call" list in my country. The most ridiculous thing is that they're trying to sell me some English courses, and I've told them I don't even need them, but of course, they just want to sell. I'll have to muster up the courage to pick up the phone and play loud and freaky porn for them in the background until they decide I'm a deranged individual who shouldn't be messed with.