Vodacom worst service provider - complete *******

Terrible service. Terrible network reception. Several dropped calls. Disappearing data and airtime all the time. No assistance by Vodacom customer care. Worst service provider generally. I'm on a corporate contract, I'm usually in the office so I don't use my cellphone airtime and data often - I use landline and wifi from work. But my monthly allocation on my cell runs out before the 15th each month, regardless of my usage. I have no subscriptions. No one has helped at Vodacom despite several pleas. I top up from the 15th till month end...but even that airtime doesn't last. It makes no sense.