Robbing of deposit

I have up until now (10 February 2021) not yet received my refund on key deposit from Kemprent since I returned the keys in January 2021 after I moved out. I have called several times and the lady`s excuse was that she is so swamped with e-mails since lockdown, when I phone her again today she ask someone else to speak to me and informed me that she could not pay me the money cause she used the money when I was in areas, however I paid up all the outstanding monies owed still- have the proof of payments. Must say Kemprent is not very keen on refunding people`s deposits but eager to take their monies.