https://amp.theguardian.com/money/2023/oct/23/my-o2-mobile-contract-was-cancelled-against-my-will
What is interesting here is what Plan said when challenged.
I asked Plan.com about your case, and it says a third-party sales company over which it had no control had (mis-)sold you its plan. It says the delays in resolving this were down to it asking that company to explain itself.
Thoughts...
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
