Frustrated Vodacom Customer *********** Vodacom Agents

I am very frustrated with Vodacom and how they treat their customers, After being a loyal and paying customer for 5 years i am still struggling to have my phone make calls, They changed my Contract to Data only without informing me, Now i am stuck with a phone that doesn't make outgoing calls. Every time i call their client care their agents drops the calls once you mention that you are calling with a complaint. They refuse to give you the complaints department's email or contact number, They also refuse to have you speak to a Manager. Your agents at Vodacom are frustrating your customers by hanging up on them. May you please investigate this as i do not know where else to get help