Contract break to losing access to my bank account

Vodacom decided from day one to run the debit order on the 25th instead of the 1st as PER OUR CONTRACT. So it runs BEFORE payday. I begged them for months to fix this. They did not do this. Then they decided to cancel the order instead of fixing it. I thought that they moved it and it was with my standard battery of debit orders. So I missed 2 payments. They notified me. I paid them promptly. Unfortunately I used an older dead contract's ref as the ref number. They sent me a statement to confirm the payment, but the problematic account was still in arrears. I let them know as soon as I realized my mistake. They asked me to send them a proof of the payment, I forwarded the emails from my bank. Nothing happened. Meanwhile my NUMBER STOPPED WORKING. I got through 3 times (other times I gave up after holding for 40 minutes or more - got screenshots to prove this). Every time they asked for proof, I forwarded the email. I never got a reference number for my case so I had to re-explain my situation every time. On call 4 they told me the format of my POP is wrong. Now because I can't authenticate with my bank due to a dead number, I cannot access my internet banking. What a f*cking mess.