It's not an unheard of thing to happen, and unfortunately you have been unlucky. The phenomenon is known as "wire drawing" where the hot,high pressure combustion gasses, once they have established an escape route via the failed gasket, eat into the metal either side of the failure. Depending on the level of damage, you may be able to have the top of the block surface ground in much the same way as re surfacing a cylinder head. However, the limiting factor is the amount of material which needs to be removed. Cylinder head gaskets are available in various thicknesses dependant upon how much the pistons protrude from the bores at Top Dead Centre. the gaskets range from 1.25mm to 1.45 mm so it doesn't give much room for error. In some cases it is possible to fit two gaskets, with varying degrees of success, or specially made shim plates, but that tends to be the domain of larger engines, and I'm not sure if such things are available for these engines anyway. It may be better to try and source a 2nd hand engine from a reputable breaker, or, if the cylinder head is still OK a "short block" which can be rebuilt with your existing parts.
2008 2.0 TDCi Zetec