Locking of data account

My vodacom data account has been soft-locked on contract. However, it is now impossible to unlock it and add top-up bundels. The bundel that I bought for R99 has dissapeared into a black hole, and my account remains locked despite three or four calls to the call centre. How is it possible that these big corporations can simply walk over customers by way of rude and unhelpful call centres. We seem to be completely helpless.....perhaps vote with your leggs and support....walk to another company.