it seems you stole something but because no proof has been shown you feel there is no right upon the employer to raise the matter. Well..... did you steal or not ?? If you did you deserve the sack at least. If you did not steal then stand by that even if some sort of "evidence" is alleged. If you are accused of stealing (and you did not steal) with no evidence whatsoever this could be constructive dismissal which is illegal. get a trade union on to it.