worst service in South Africa

I administer 28 contracts for my company with vodacom. I am only allowed to contact them a certain amount of times then my phone number gets blocked. Supervisors promise to contact you back but never do. Once your number has been blocked you have to phone a cell number to try and get hold of someone. They promise delivery within 48 hours. It's been 3 days but still no delivery. And no call to let you know why. Is there any company that wants to take over our 28 contracts. Our monthly spend is over R30000. After emailing customer service I still have had no reply.