10 year torture P.G.

blue11

My ex had a joint and several PG with a business partner - My ex had signed the house as security I HAD NOT! - we divorced few years later... all this time we have been making payments to the bank on and off - without me working my ex would not have been able to pay what he did! Final lot was a series of instalments and then a lump sum, tried to get a loan for the lump sum and unbeknown to us the bank had already placed a CCJ on my ex. and added vast interest on the top.
I remained in the marital home with children, mortgage remains in joint names - yet now they are putting charge on the property which will be a 3rd charge as I have a business that has facilities secured on the property.
Can they do this when it was nothing to do with me and I never signed security?
My ex was not living at the property when the CCJ was issued, should it have been sent to his new abode?
It has ruined our lives, it haunts me daily and made me so ill,