Lost Airtime Vodacom

I have a complaint about Vodacom for days now i have been trying to contact them, its always high volume at moment so i have to drop the call. I have tried for days now ti get through to network, always busy i want to complain about my airtime that keep on disappearing this is perthectic and its not the 1st time this is the 3rd time my airtime just disappears into thin air. I am on temporary disability so i cant always afford to buy the time. This is simply perthectic and frustrating ,one cannot get through to them no matter how many times you try. Someone must look into why vodacom keeps taking airtime, money is tuff to mention and even in this time its even harder and then your airtime just disappears in to thin air.....on top of that i have data but it keeps telling me i am using out of bundle airtime how is this possible....i want to know why and demand a solution and my airtime to be refunded. Please can s ok meone contact me