dissapearing data and no service from the call center

Good morning

I have a complaint with my data that is disappearing. I have a wifi with 10gig @139 PM that I receive on the 1st of each month but by the 7th or 8th its finished. Its highly impossible that I use 1 GIG a day on wattsup, facebook and Instagram coz that’s what I use and no other apps. Please assist in investigating the matter because when I call they tell me about internet and I use that at work and not with my phone. All this basically it means I do nothing and always on my phone which is impossible.

Now I called the call centre and the ladyNomzamo Mnqondo Telkom mobile -customer servise Representative Tel:+27 (0) 081 180 ********** is telling me that she can log a call for my data usage or have a complaints department to take this further