Complaint

I have a problem of a blocked phone with cell C that does not register any SIM cards it was blocked due to arrears now it’s been 6months if not more since I payed them fully I’m no longer in arrears. I went to a store where they gave me a form to fill after a month there was no response. Then went again they emailed again but no response back then called customer care still they can’t help me saying they don’t have any details on my name.