Vodacoms Accounts/Billing Dept is atrocious

I am absolutely and totally annoyed with Vodacom. They need more people like Ettiene in their Accounts/Billing Dept. I bought 5GB of airtime last month because my airtime disappeared. Ettiene rep**** to my response and was very helpful. Although I guess he can only do his job - not the rest of Vodacams incapable staff. I ended up with approx. 13GB of airtime with the time I bought and the time Ettiene so kindly reimbursed me with and my Monthly 5GB data Bundle. Well I have managed to log onto the Vodacom site and what do I find. The airtime I bought which expires on 17.1.16 is not being used and the 5GB from Ettiene which expires on 31.1.16 is not being used. But the bright sparks at Vodacom are taking the airtime I use off my monthly data bundle which expires on the 1.3.16. Now, do you need to be a Rocket Scientist to see what is happening here!!! In other words I am going to lose all my airtime .... yet again!!!! Surely you take airtime off the first bundle that was bought and leave the latest for last. I sent an sms to the billing dept. to get in touch with me immediately on the 7.1.16 and also complained about the signal! Still waiting for a response! Vodacom change your staff!