I received the power cord with the wrong plug so it didn't fit/work with my Garmin Echo Map Chirp 74SV. How do I return it and get a loan for it? I need the right power cord. The chord description on the bag it came in says 7Xsv and a few others. Does not fit 74SV. I do not want to return what I received and intend to purchase the correct one from West Marine.