rejected claim

I have car insurance with a&g . They rejected my claim because I didn't disclose previous claim with previous insurance.Auto & General asked me with i had previcous claim with my previous insurance I said no telephonically , they called previous insurance .Auto & general ask them about my previous history they say she lay claim but she did not take vehicle for repair. So my previous insurance didn't pay or process my claim because I ddnt take my car repair. That's why when sale consultants asked me if had previous claim I said no because I didn't take car for repairs. And asked claim processes to request for previous report that show they didn't pay it.It took them almost 3weeks solve claim.Claim processor said he willtake matter his business manager he will give me feed back after two days . i waited him for updates for3days,when I call him for updates he was unavailable until I sent email. His reply was my claim rejected of false information which he didn't have evidence on . I asked him did do follow up with previous insurance about claim . He said no , his said him and team has decided to rejected claim . They tried of me keeping on call or senting emails asking for updates. So his waiting for the manager to sign or confirm rejecting letter .