VODACOM IS USELESS

I took out a new contract in dec 2020. i was told the deal is R399. i got a view of this months payment and realized that its way to high. i called vodacom 13 JAN 2021. They told me that they are over charging me as i am correct. 2 days later, i am still waiting for someone to contact me. i received 2 MISSED calls now. and i mean MISSED CALLS. it didn't ring even for 2 seconds. im getting frustrated. can i never just be happy with Vodacom? i chatted to them this morning and i was told me complaints was only assigned TODAY! i mean WHAT THE HEL!!!!! my boss will kill me if i do something 2days later then intended!!! another thing is when i received the contract i was told to wait 15days and i will receive my study voucher. GUESS WHAT!!!!!!!!!!!! STILL WAITING !!!!!!!!!!!.. Ive got all proof and references and screens shots!! if you don't sort this out today you can cancel all my contracts and get your phones collected. just as i signed an agreement, you agreed to.