Can I sue my storage company if they sold my 2 storage units with all that I own from my entire home, if they gave me an extension date to pay in full and sold my items before the date they gave me while I was assembling the money to pay them off. They gave me 15 days from a letter they sent him, example June 1 and the date of sale would be June 13th, but they sold it all on June 6th? Can I sue them? They misinformed me?
Sounds like you have a breach of contract and possibly more, See a lawyer in your area.
Your written storage agreement will prevail. I suggest you consult an attorney to review your paperwork.