Jiffy lube put oil in master cylinder?

I took my 08 honda accord to jiffy lube for an oil change and 4 days later my break petal stated going to the floor, I thought it was my break pads so I took it to Firestone they said someone put oil or transmission fluid in my master cylinder over $1900 not including the ABS system next day I took car to Just Breaks they said someone put oil or something other that break fluid in master cylinder over $1500 not including ABS. Call my insurance to get rental car and investigation they find the same thing. Investigator calls manager at Jiffy Lube he said its possible that it could have happened here told me to fill out incident report call the store for the report the GM says it did not happen here cause we don't mess with peoples break fluid I told him I have my last two invoices and they both are from Jiffy Lube and no one else works on my car. Im wondering if I have a chance in getting Jiffy Lube to own up

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