Ridiculous billing and pathetic service

I've been with Vodacom for over 2 decades and have a data contract with them for a lil over 5 years. I've never ever had missed a payment(debit order and manual payment). My February bill was due 28th and had made payment on the 26th to my surprise my account in arrears. I phone the collection department to enquire on the matter, "Nhlanhla' agent who assisted me stated that I made my payment late hence the penalty fee. She stated even when a call can be logged in this regard the outcome will still be the same. I've been waiting for their "Solution expert call" since 3rd March 2021 as they promised "within 24hours" and till this very day NOTHING. Vodacom is ridiculously making money out of us for no apparent reason. I cannot wait for the contract to end.