Until contract renewal you are stuffed price wise as unbundling landline will likely mean no discount and may go up.
There is no harm ringing in to ask if you can jig around your package under a service change receipt. If you get on with the advisor, they may be helpful and able to change it without full recontracting, but you might have to move up or down on broadband speed to meet the available discount codes they have for that day.
After 8am is usually best time, but can still go offshore as no longer any guarantee. I've always found avoiding customer service and using the leaving vitgin option on the phone the best route.
As it sounds like you are in contract, you are at mercy of advisor so I'd be polite and just have a conversation on why you don't feel like you are getting the best value because at end of contract you would simply cancel all services. I wouldn't mention getting an O2 SIM as this is far cheaper with more data from uSwitch.com instead of via VM and still volts your broadband speed up after 14 days. You are better off going down a broadband speed tier, ditching the landline, then independently getting the O2 SIM via uSwitch, and that would then the your broadband speed back up a tier under VOLT within 14 days.
