My Thuja Orientalis Aurea Nana have grown nearly 2 metres and nearly 80cms thick hedge

Hi Annisetta and welcome to GoY. Could you add a photo to your question please showing the actual hedge. The only Thuja Orientalis Aurea Nana is a very dwarf conifer that grows to, perhaps, a metre but usually less it also isn't normally considered as a hedging shrub and I wonder if this is actually what you have.

I was thinking the same. I wonder if you were mis sold the plants.

as Moongrower says a photo would help.
welcome from me too :o)

That was my thought SBG... mis-sold plants.

'Aurea Nana' grows larger in warm climates than it does in cold ones--and guess who writes the descriptions! Also, 'Beverlyensis', which is a much larger variety, has been sold as 'Aurea Nana'. 'Raffles' is a more reliably dwarf variety, though it may be hard to find. The slightly larger 'Westmont' is easier to find, but it is a different texture, and it suffers when the temperature goes over 40º. I suspect that it is actually a different species of Thuja.

Me too Tugb. but until Annisetta comes back to us we can't do much more...