[Closed] Unable to remove pedals.......any tips please????

Hi...

I bought a near enough new charge duster rigid which is fitted with a truvativ crankset a couple of weeks ago....

have tried to remove the flat pedals and put my SPD's on.....cant get the right hand (had to be chainring) side off.....have ruined a good 15mm spanner and my mates hardened steel pedal spanner so far.....

it cant be corroded or anything the bike is near enough new.....

any ideas would be welcome.....

thanks.