Mondo doesn't care about it's customers

The worst thing you can do for yourself is take out a cellphone contract via Mondo, I strongly advise you go straight to the telecommunication service providers. My phone is not even 6 months old, it won't switch on, Telekom has asked me to bring a proof of delivery, I requested this from Mondo 2 months ago I am still waiting. Their sales agents will sell you a dream but it's the worst mistake you can make, I'm currently paying for a phone which doesn't work. They have no problem sending me invoices at my work place but can't bring me a simple proof of delivery. They don't care for their clients at all.