Two Payments in one month

i have two contracts with Vodacom, and i usually use the pay your bill option on their vodacom app every month and everything goes well, but to my suprise in the month of February 2022 i paid on the 19th and the app kept giving me the option to pay, but on my bank statement it shows that there is money that went out through the vodacom app, due to time i couldnt follow up on that, now on the 28th they debited my account, after 4 hours of waiting for an agent to assist me, i asked them why because i paid, they told me they dont see it, i then suggested to send them the statement. after receiving the statement, they said they are escalating the matter. i then told them i am going to reverse the debit order becaue i sent proof of payment, they said if i do so i will be charged. as it is im running on a minus budget because of them, some of my debit orders were not provided for, and its their fault because of their faulty app but they are telling me they will charge me. on top of that, i didnt even get a reference for the call so i cant even follow up. i am so dissappointed in this company