Bent valves 2010 octavia vrs petrol

help needed please!!

having read the ccza issues regarding the tensioner I have just asked my mechanic and he says perhaps my tensioner was okay?? However it sounds as though my car suffered identical fate as others. Tryed to start car and out of blue it wouldnt start. fsh not dealer. 62k. no issues atall. facing 3k bill to put in recon engine. any ideas anybody please!! I have no clue about cars am just a humble ambulance paramedic looking for some help please!! I did have cause to take the car into skoda 2013 in warranty cos of revving when i wasnt touching accelerator. might this be relevant? I have my whole engine ordered already cos the mechanic is saying apart from the valves there isnt any visible damage but the cause is totally unknown.Urghh!! I didnt buy the car new either as ive read its under 6years old.