Cleaning puppy urine surrounded by hearth rug? I had a puppy urinate several times on my mat, at most...

I had a puppy urinate several times on my mat, at most 5-8 times. It never left a stain or an odor, confirmed by my house and friends. The carpet be cleaned several times over the next 6-8 months and no odor or stain ever come after cleaning. I moved out of my apartment and the management insists that within was an odor and stains. We cleaned the mat after we moved out for 12 hours. Is there any possibility of a smell and or stain to come through after adjectives this time and cleaning.
Untidy and unorganised..?
Answers:    No, they are probably just trying to hang on to the deposit...
How do I achieve adjectives on stains stale...
no