Poor service in terms of claim payout

I opened and insurance for home content with dial direct, when I opened it I was not advised anything about keeping proof of payment whatsoever. In December 2021 my house got broken into. I contacted dial direct to inform them after opening a case with the police. Upon my surprise, my claim was not approved due to me being unable to submit proof of purchase. All the items I have bought prior to taking out the insurance, now they tell me I need to go back to the stores to ask for proof of purchase as if one can remember where you bought each and every time or even when. I'm deeply disappointed in the service I received and I will not recommend dial direct to anyone. I mean who will go and lie under oath about your things that got ****** from your house. I've paid premiums and might never recover my ****** items. I feel **********. Can anyone please advice me which lawyers will be able to assist me with my case?