damaged goods

I purchased WiFi and a media pad 2 months ago I received them and only to find out the media pad was damaged I returned it the following day mind you he took my invoice and said he will scan and e-mail them, they did not give me a new pad but sent it for repairs, I'm here for the 4th time and he keeps saying he will call the technians, its been 2 months and I have not even used the pad, the 5G of my WiFi lasts only 13 days never again will I purchase anything for telkom SA, im told today that the warehouse is closed I told him I am not going without my invoice as its been 2months waiting for him to e-mail it