Poor customer service

On 5 November 2015 my SIM card stopped working....after sending to Samsung<br> We were informed phone has been blacklisted by Telkom for debt owing.<br> I have no contract neither was the phone purchased from Telkom Mobile.<br> After 4 Frustrating days of poor service still no joy.They requested we send them invoice of purchase.<br> This has been done.Now they want us to give them proof of purchase from Samsung to my supplier.<br> They have copy of invoice from me.i have asked them to communicate directly with my supplier.5days without a phone.No joy.Pathetic customer service.Asked for senior management-no joy.Cannot believe service levels from Telkom mobile can be so poor.The sad thing is that I was initially informed that the lady that does the blacklisting<br> Punched in incorrect Imei number.Where to now?