Tarmac Driveway has "rough" areas

[Feebee0129]

We had a new tarmac driveway installed about 11 months ago as soon as they finished I said a couple of areas looked a bit rough (not smooth) and the stones looked a bit bigger and gappy, they said it was nothing to worry about. Now after 11 months later the area looks worse and is not a smooth finish as I would expect from a new tarmac driveway, the installers are saying it’s not them and must be the tarmac, but the tarmac company is saying it’s the installers. Not sure where to go or what to do ?