60+60 expired within 3 month with 87.7 GB unused

I recharged a 60GB+60GB data bundle (R1800 for 12 months) on 5/23. However, the data bundle got expired on 8/21, but according to my data record, I only used 32.3GB before the expiry date, and the remaining 87.7GB were gone. Because I was on trip to Taiwan from 8/22 to 9/6, I went to Telkom Eastgate branch for technical query on 9/6 and 9/12.But the clerks' attitude really ****ed me off. They kept misleading me to believe that I used up all 120GB within 3 months by showing me data records which tell nothing but a bunch of numbers instead of systematically showing the total amount of the data usage within 3 month period.(I wonder who designed this stupid system which doesn't even have the basic function of statistics.) They also insisted that there would not be any mistake in their system. It was not until the problem in their system was pointed out that they were willing to open a case with case no. ***5. However, this nightmare never ends. Even though they said I can check the result within 72 working hours, the case was actually passed to their technical department 5 days after it was opened on 9/12. And I have been waiting for their response for over 240 hours.