5GB Data Missing for Nov - REFERENCE NO *** - BAD SERVICE AND FEEDBACK

On the 8th Nov 2107at 05h50 to 06h20 I switched on my router with simcard ( ********** ) for the 1st time for the month of Nov 2017. My router kept going off and I did a balance enquiry and the data for Nov was only 5.00KB expiring 01.12.17. I contacted Cell C Customer care and eventually I was put through to the technical department and was advised that the data used does not correspond with the history of the simcard. I was given a ref no ********** 0133 and today I followed up as Cell C keep calling on the data card and not on the number I gave them where they can contact me. Today I was told that the data was used on the 8th, yet the agent told me again that the data used does not correspond with the history of the simcard. I did not use 5GB Data in less than 20 min. Cell C must get their facts right and refund my data with immediate effect. What was the 5GB day data used on? Cell C cannot answer my question. The staff is uneducated and does not listen to my complaint!?!?!?!?!?! Resolve this immediately.