Vodacom customer service call centre

Vodacom staff call centre show very little customer service to customers. Errors, which not arise anyway, are only corrected by a person getting extremely irate and demanding a more senior person to speak to. Apologies abound but corrective action is not taken unless, once more, you become angry. The call centre agents shout, laugh and have other personal converations so loudly, you literally cannot hear yourself speak. After 18 years as a contract customer, I think it is time to find a better service provider. Why have call centres at all if they are just there to answer the phone, leave you attended for hours or cut off your calls?