I am billed for a faulty phone

I have upgraded with Mondo before with no hassles, so I trusted them to upgrade using them again. However, the phone that I chose was however faulty, I logged it on May within the prescribed time, I was however informed by Bianca that collection will take place within 7 days. The phone has not been collected as yet, and I have made several attempts to follow up, I am given the same feedback, Bianca will call you back before end of trade. Nothing has happened as yet, I am really tired of such service, shows lack of commitment and incompetency on your part. In a week's time you will bill me for a device I stooped using within 3 days of receiving the device. <br> <br> I hope that this gets resolved without me having to follow up. I also hope that my account will not be billed with this, as I've mentioned on my non responded complain on Facebook, I know my CPA. I know where I stand with this, otherwise I wouldn't have taken up my precious time to follow up. <br> <br> It's really bad service, what you portray is just wanting to not take ownership. I am expecting your device to be collected tomorrow, contract reversed ASAP, before my payday