No service at all

I purchased a Samsung Galaxy Note 4 from one of your telkom clients in April this year. The phone has now been blacklisted. I went in to your telkom mobile shop in tygervalley and explained to them that the original owner(your client) sold the handset to me and that it please needs to be unblacklisted as I am now losing money due to your client not honouring his contract. I was told to call your call centre and ***** department which I have done. They asked me to forward the proof that I purchased the phone which I did. It has been 2 weeks now and no response. I think its fair that the client needs to be blacklisted for not paying his account, but by blacklisting the handset I am losing R5000 I paid for the device. I have the original telkom proof of purchase I received from your client as well as email conversations between us that proof I bought it from him. Please contact me as soon as possible to get this sorted out.