I did this with my house insurance from Tesco. They hiked it by a hundred quid so I shopped round and got a better deal with direct line saving 50 odd quid. Called rescission to cancel and then went through the "customer retention" bit. Managed to get then to drop it to almost the same as last year and give me 20 quid in gift cards. Worth haggling and asking what they can throw in extra if they can't drop the price. Oh, and double clubcard points too!
(Beaverman Opulence, I has it., Fri 11 Nov 2011, 13:43, 1 reply)

Tesco. Pah.
Some years ago when I moved house I had my car insurance with them - when I told them about the move they hiked the fees due to the relocation so I told them I would shop around, and found a substantially cheaper offer elsewhere.

Phoned Tesco to cancel - oh, I can't do that as the thieving twunts have already taken the extra, despite me not authorising the payment. Took four weeks of phonecalls to get the money back, and spent several years avoiding their stores at all costs... sadly now they are so ubiquitous that is nigh on impossible.
(Captain Skippy pooed in a bag and left it on your doorstep, Fri 11 Nov 2011, 18:59, closed)