Tenancy review for 24 Kiln Orchard in Bradley, Newton Abbot rented via Your Move

Agency rating: 1

This was my first move-out from living with my parents, so I wasn't very aware of the dangers of rip-off agencies. I was relying on my house-mate's knowledge, as he was experience in moving around and had been with a lot of agencies and private landlords.
YourMove did not show us the tenancy agreement until we had already submitted our security deposit of £750, and then took £375 for referencing fees.
When my housemate moved out, and left me there to invite my sister in his place, the agency charged another £375 referencing fee. I stated that this was unreasonable, as I had already been referenced, so only my sister should be checked; but they stated that I would be re-referenced every time a change in the tenancy agreement was made.
The agency had quarterly inspections of the house which were not strict, but did take notes that I was not aware of until I came to move out.
After a year of living there, my sister was on the gist of moving out, and I was in the difficult situation of trying to stay myself while trying to advertise to a new tenant for a property run by an agent that I myself was not very happy with.
Then the agency sprung an email stating that they wanted £100 fee to renew the tenancy agreement for the next year, and that was the last straw.
I found a new place and left immediately, and they hit me up for another charge of £125 for a "check-out fee" that was to pay for the check out inspection.
My sister and I cleaned the place together very well, I even got a carpet cleaner in. As we were both a bit OCD, I think we got it to a very high-quality.
During the check-out inspection, stupid things were highlighted, like dust in between the slats of a wardrobe's louvre door, and dust behind the bathroom ventilation fan (which I couldn't get to through the cover plate). Other things like: dusty front door, light porch ceiling mould, light electric hob marking, light mark on wall near light switch, smear on mirror; were all raised. These things were not even visible, and the photographs taken didn't even show anything.
After moving out, I was hit with a £422 fine against my security deposit to fix these "findings". Since then, I have disagreed to their claim and I am filing a dispute with the security deposit service "MyDeposits".
They refuse to give me any contact details of the landlord so that I may communicate with them, and have done nothing but try to wrench money from me.
As a first-time renter this experience was a real eye-opener; and one that I plan on doing my best to avoid in the future.

Property rating: 7

A "3 bedroom" house (2 bedrooms and one 2x3.5 metre room) in a nice enough neighbourhood that resides in a street in from the Ashburton road. The property had a large lounge and kitchen, as well as back garden, driveway, and garage. The house was £750 a month bills not included.

Area rating: 6

The area was nice, neighbours were friendly enough. It was a short walk from town and there were convenience stores nearby. I'd recommend living there.
My only slight issue was the lack of parking other than the single space in my driveway.