Business ProfileforCopper Safe Storage

My ******** have been renting a storage room from a local business Main Gate Self Storage *******************************************************. It was sold over the holidays to a Copper Safe Storage. Physically and signage wise it has not change. Our monthly fee has been paid by check for the past 4 years and either walked into the office or dropped in their mail slot after hours. I was returning from ******** (approx. 10pm) on the second of this month. And dropped our check in an envelop into the mail slot. About a week later my wife said she received a text of about a late fee asset to our January bill. My wife call the company and she was told to right another check and mail it to a different Company and address. And that she could go back to the office and get her old check. I went to the office the next day and surprise the office was lock with a note taped to the door. I looked thru the glass a to observe a pile of mail on the floor. I call the number and explained the situation and was told the business was working remotely from ******* and I would have to write them another check. I said you created this problem and need to pick up everyones late payments that are on your floor of that office. We proceeded to empty out or storage room. On the 15th I peeked thru the front door window and the pile of mail has been removed. However, my wife continues to receive harassing texts and emails to pay our fee and late charges. We completed our move out of the storage unit Tuesday, swept clean. We want to return the access door key. We havent done anything wrong but no one in their remote office can do is say we owe them money and late feeds. Wont even give us an address to mail their access key too.