I've had the same issue with o2, the day after I renewed the contract for my tablet with them, they announced that they had formed a partnership with Virgin Media! We'd had no warning that it was in the offing and if I had, I would never have renewed the contract with them. I'm waiting for the contract on my phone to expire and I won't be renewing that.
Virgin Media even had the nerve to approach me, looking for a sale, when the removal men where literally carrying my belongings into my flat on the day I moved in. They then bombarded me with junk mail for months on end.
On a side note, although this may be a coincidence, the merger happened last week, and today, for the first time in two years, I'm getting spam calls!
Shall we reboot our cartoons thread again? 😁