Contents of the policy contract changed without my consent

I have a Greenlight policy with Old Mutual. In 2018, I requested a copy of the contract because I had lost the original. The contract showed that I had disclosed my chronic condition. To my surprise in 2019, when I was updating my premiums - I realised that the contents of the contract have been changed - the chronic condition that I disclosed at the time of taking the contract is no longer on the contract. I contacted them, but they were very defensive - coming up with all the excuses. I am prepared to fight - I know what they are trying to do. It's not the first time that I have a problem with Old Mutual regarding this policy - in 2016 I had to approach the ombudsman for my case to be resolved, and they comp**** immediately.