Faulty phone

Last week Thursday on the 18th i had to re-book my phone for repairs at Cell C Gateway because the phone's screen went blank,AGAIN!it has only been 3 weeks since my phone was returned to me for the same issue,i honestly cannot be booking my phone every month for repairs,please get the person in charge to authorize a new device for me as the deice is obviously faulty,i don need the phone anymore.tommorow my debit order will go off and i cant pay for a device that i dont have. My reference number is KWUMH404837,if you cannot give me a new device by today then forget about me paying, you would have lost another client.