Yep.
Essentially my problem was that I bought a phone in 2000 when WAP was the rage (basic mobile internet) as I didn't have web at home at the time having just finished uni and I wanted to check email etc.
I bought 2 tariffs (they were pushing this at the time), the one with lots of free minutes was to fund the web access. This all came from the Orange shop. To cut a long story short, it didn't work the way they said it would and I was stuck paying for a contract that didn't deliver, plus paying through the nose for my mobile usage.
They kept cancelling and refunding bills. Went on for about 6 months with increasing acrimony. Eventually they blacklisted me despite a complaint being in with them and having been told by a team leader not to pay. I complained to the executive office and asked what the hell was going on. It got immediately sorted (and they apologised profusely for the blacklisting which they "undid") and again, money was refunded.
Since their systems were unable to support the arrangement they sold me and it was always going to be a nightmare, they agreed to cancel the contract with immediate effect (6 months into a 12 month contract or something like that).
Ultimately, therefore I paid almost nothing for 6 months' usage, got a free phone and went to another company.
It wasn't what I intended and frankly it was never worth the aggro they caused me so I don't recommend it as a course of action, but yes in the end, where I was able to show costs etc they were fine - essentially cancelling or refunding bills is something they can do easily, actually paying "compensation" takes more effort.
You should have a case for compensation because of the default.
Hope this helps.
mr tom.