Yesterday I upgraded my mobile internet with emobile at Yodabashi camera. Today I found that the particular model I signed up for was not functioning as I would like so I went back today and asked if I could exchange it for a different model and they refused. I assumed that they would have no choice but to allow the exchange because I was within the 7 day cooling off period or are mobile phone contracts a different kettle of fish. My Japanese is poor so I can't ring Emobile.
Is there anything else I can do about this?