Wrong price on upgrade. Cant give sales recording!

I upgraded my adsl line from 10gb to uncapped. when i got my bill with the new uncapped product i noticed it was more than i was quoted. <br> <br> After 5 calls i have finally had enough of their non sense. This has been going on from October 2015 when i reported the problem the first time. They can all see the notes loaded onto my account but no one can resolve my problem.<br> <br> All i want is the original sales call when i upgraded, if i am wrong about the price that i was quoted then all is well, no harm done. All i hear is that the price i am saying i was quoted was never a promotional price, well fine, please just prove that to me.<br> <br> To add to all of this i see that in December \SOMEONE' who no one can verify