Faulty sink - cost of re-installation?

Hi

I recently bought a new granite sink which has been installed (at my expense and by my plumber) in a new worktop.

The sink developed a crack within about a month and I contacted the company who did agree eventually to provide a new one.

They delivered the new one the other day but want to take the old one away. To give the sink back to them I will have to pay for a plumber to uninstall it and then pay for re-installation costs for the new one. Are the company liable to pay the costs for uninstalling and re-installation? I have looked at the T and Cs I got when buying the sink and it doesn't specify anything about this situation.

Thanks

Thanks very much.

They are trying to say the manufacturer will cover £60 of the costs but no more which does not cover a plumber.

If they won't replace at no cost to me am I entitled to ask for a refund?