failure to unblacklist iphone 5s after a month

For the past month I have been battling with Vodacom Canal Walk to unblacklist my Iphone 5s (IMEI number: ***. Serial Number: F2LLV0QEFRC6).<br> <br> For multiple times over the past month (16 Jan - 14 Feb) I have been told to switch the phone off for 72 hours, then try again. STILL THE PHONE DOES NOT RECOGNIZE MY SIM CARD.<br> <br> This is what happens in the top left corner (SERVICE CORNER) when I switch the phone on:<br> <br> -Top left corner reads \SEARCHING". <br> -I then have \""one circle\"" of signal strength (only lasts for about 10 seconds)"