Same situation, with BP on same plan. No issues with service or support. Service is good, no need of support. Wish they would offer something to retain existing customers.
For us the best saving would be to switch provider every year for a discount. I don't want to do this, as there is often the 30 day switch from existing, and sometimes issues in the switch over.
FWIW I had a good result in the end. Initially, they wouldn't let me take the offer, but when I emailed their billing team asking to be disconnected as I was moving due to cost, they gave me the 3 month free offer. Only took a day to flip to the 100/100 plan, so I'm happy with BigPipe another year.