Customer is always wrong at Vodacom

Customer service at Vodacom is seriously bad. I converted my prepaid number to a contract since I have been with vodacom for 20+ years, and have been on contract for a long time. After a few missed payments which I explained the reason and still paying for the contract, my number was given to a new contract client after I was alerted by my freinds, family and colleagues that I exited my whattsapp groups! (which was obviously done by the new client) WOW..Vodacom4U! I had to call my own number and the new recipient was just as stunned as I was cause she just signed the contract few days ago! You can then imagine the inconvenience from both sides, she told me literally my whole life is in that number, from bank OTPs, medical aid communication, business stuff, car tracker info, various accounts info etc and the 100 calls she gets having to explain its not the person they are looking for. Yohhhh I'm just gutted Im seriously failing to understand how this company. operates. I just want to know if I can get my number back and just deactivate the sim cards that came with the contract initally?