Jo-Ann Fabric and Craft Stores

I was in the Riverdale location yesterday, 09/09/15. Coon Rapids MN. I purchased one ball of yarn at 4.99 Clerk took my 20.00 bill, broke eye contact to chat with another salesperson, then insisted I had given her 10.00. Manager, Dave, got involved and said he would give me a call today either way, after the registers had been closed down to determine if they were 10.00 over. It is now 8 pm and of course I received no call. Quickly, my background is 40 years in retail, 20 in management. I have seen this happen at least 50 times. No one ever got their money back, even tho we sometimes had video that the customer was right...but the register had closed out correctly. Obviously, someone made that happen? I now do sales training seminars and will do as much as possible to insure that no one shops at this location again. Basic retail training is to take the cash, then say "4.99 out of 10.00? right?" This could have all been avoided. Thus one has to think that it was deliberate.