● I'm getting sick and tired of these salespeople. Can't they understand that if I don't buy something after several visits, then I'm never going to buy it? (It's) Incredible! ● These sales pitches are getting on my nerves. Why can't they figure out that if I don't buy something every time they come by, then I'm never going to buy it?
「ああもしつこい」のニュアンスを get sick and tired of ... (…にうんざりする)を使って表現しています。get on a person's nerves は「神経にさわる」の意味。
I've had enough of these annoying commercials (もうコマーシャルにはうんざりだよ)