BAD SERVICE

I was looking for an upgrade on my number which has paid up,I'm a regular client for more than 20 yrs with vodacom,due to Covid 19,I was paying my account monthly however,with shortfall of R400 but I was paying R1000 or R1200 ,so this people they are refusing to give me the new phone so they are treating me like a client who is not their regular client,they are being rude and not assisting me the way I wanted,, it's like I have not paying any cent to them I'm not happy with their treatment towards me as a client I want the management to look on this case and contactvtge shop that was assisting me so that I can get another phone and they need to apologize to me and also give me facts or valid reason why are they refusing to give me the phone even if I'm paying them if not that I will cancel all my contracts that are due and paid up and I will work with another service provider which can give me better service than them