HORRIFIC CLIENTELE

I cant understand why these agents are not able to call back their clients when they are cut off. I have been calling since a.m and I just needed confirmation of the outstanding bill as the Telkom app isnt working for my business account. Called five agents using my airtime and my calls got dropped and non of those agents bother to revert back even on my email address. They have my contact details. Why is it that the TELKOM AND ENTIRE ICT COMPANY IS NOT ALLOWING THEIR AGENTS TO REVERT BACK TO THEIR CLIENTS? ITS APPALLING SERVICES.