EMTELECOM *****ING OUR MONEY

We bought a mobile phone for use in our office with a very competitive call rate from Vodacom. The procedure to buy airtime is to deposit money in certain increments which get picked up as airtime purchases so that the account is credited immediately. The first re-charge worked perfectly and since then we've had nothing but problems getting airtime loaded with several days passing and the owner having to be contacted in order to get this done. Now when we call the contact centre, the number is not available, and the representative keeps rejecting the calls. I'm wondering whether other people are experiencing similar problems with getting their airtime loaded?