Won't cancel an application done 10 minutes prior

I was so disgusted with this 2 faced behaviour from a clearly desperate-for -business's company! I called their call centre to sign up for a fixed LTE service because I was having endless issues with My current ISP. Spoke to a very professional female agent. She sent the details for me to EFT the Sign up fee (courier fee for the sim card and router) because she said if I don't EFT the debit order will only go off days later and I will wait long for the sim and router. When I logged into my online banking I realised that my current ISP had already debited me for their subscription although I had cancelled. I did not have enough cash to pay for both ISP's so I called WebAfrica back immediately (about 10 minutes after ending my call with previous agent). I asked the gentleman how to cancel the application for the Fixed LTE that was just done and he said he will just need my cell number and name so he can send it to be cancelled and said it should be cancelled within an hour. After 2 hours j never saw any emails or text messages from webafrica apart from 1 congratulating me on my choice of Fixed LTE. This got me worried so I used their Web chat feature to check. I explained that j cancelled and needed to check but after collecting my cell number, the online agent never responded again so I ended up dialling their number again. Spoke to another lady at their sales desk and ask her to check if the LTE application had been cancelled and she CONFIRMED that it was cancelled. Well... that same evening a debit order ran on my account for R249 (quick huh?) And after reversing it, thinking maybe it was just the debit order that was already set and they couldn't stop, but nooooo, I find in my mailbox an email saying I need to make this R249 payment as soon as possible and can get further details by logging into MY webaffica account... with links to log in etc. This annoyed me because this tells me they did not cancel anything. Tried the webchat again today (27 Dec) and no one responded. Waited for 15 minutes. Then tried to call their support number but when I call it just hangs up on Me. I have now completely lost trust in Webafrica. This seems like sneaky ways to retain business. I was going to sign up after sorting out my current ISP and getting a refund but now I will NOT. THEY HAVE PROVEN THAT THEY ARE DISHONEST. Their staff are an accessory to this. Maybe they were told to not let customers go under any circumstances. I have evidence of my calls to sales to cancel within minutes of my application so I will not engage this further. If Webafrica continues to persist with an open account for me I am going to the ISPA.