They find faults in the property you rent to ***** your deposit

Rented a flat for less than 3 months, they came back with a bill of 4000 to try and ***** my deposit, picking up issues that were there when i moved in, they don't show you what you signing for. The incoming inspection was not done properly as they were cleaning the flat, it was done in 10 mins, when i was leaving they send someone new, who says just a shower door must be cleaned, made me sign and later sends a report with issues that was always there. Even stuff was noted that the landlord should fix, was billed to me, they were just upset because the landlord took the property back from their management. The manager did not even respond to my email. They keep ignoring it.