Poor customer service

I took out a contract with CellC in April 2015. # weeks later I experienced problems with one of the instruments, I logged a call and the phone was collected and replaced. in August, I experienced the exact same thing and has now been waiting from 25 August to date for the phone to be collected, after I was assured that the service delivery date is 5 days. During that time I had made numerous follow ups and every time being told that an urgent collect msg was being escalated. I have come to realise that CellC is unreliable and so ith the products that the sold to me.