Don't feel bad Leon. We all have a story like this.
My friends (a small family mechanic shop) were on Telstra since the 60's. Upon seeing their phone bills, I recommended they go VOIP. They did, but naturally (sadly?) went with Telstra.
Unsurprisingly, there was much downtime in the changeover, none of which did their business any favours. Telstra were unrepentant. Some months later, it was evident they were receiving no bills. Being the honest folk they are, they called support to get the billing process on track.
Despite any direction they argued, Telstra refused to acknowledge that they had a valid account. My friends made every attempt to pay their bills. In the end, the service (Telstra DOT, running on Fibre NBN) was so unreliable, it was not even worth $0 per month... They moved to Optus, which was another brand of funny business.
As suggested Leon, how can you feel like a bad person, when you're not really a person? You're just a
number, like me