Terrible Service - Cellphoen Insurnace Repair

I booked my Blackberry Z3 handset in for repairs at Cell C Lakeside Mall on 09/05/2015, and filled in the C-Surance claim forms, and later receive the confirmation SMS. Then, by Wednesday 13/05/2015, when I have heard not a peep from Cell C or C-Surance, I call only to be told that the phone was received the previous day only - couriers that don't work weekends...ok, understandable. Various follow-up calls (from me to them, never the other way round) and then on Monday 18/05/2015, I get a quote from the repair centre for R1864.90! I immediately call C-Surance, who state that I am to ignore the quote and that - and here my blood really starts to boil - as they have forwarded my claim to the underwriters, because I was using a \non-insured SIM"in the phone at the time of the damage! At no stage whatsover"