usually when your refused they will list more than one reason (to try and justify the refusal)
someone on here not long ago, overdrawn statements was one of the reasons, i cant remember if it was the only reason for refusal, but they owned their house outright.
they asked for reconsideration and the refusal was overturned, without going thru a long wait with an appeal

............................... but not everyone will be as lucky as you, that's why I advise people, 6 bank statements and no overdrawn ones to minimize risks of refusal..