At this stage, my advice would be to leave it. When you have completed the trip, write to Customer Relations explaining as succintly as possible what the problem is, they will have access to the notes on the PNR that the Contact Centre staff having been filling in with every call. If you don't hear anything positive, just go down the MCOL route. It's probably the more productive use of your time, and it is just possible it will be credited before then.