There were, as far as I know, no lies, no fraud, no foreign money or surrepticious online influence in the Remain campaign. What the leavers point to is only warnings by George Osbourne and others that a leave vote would cause harm to our country- and it certainly has. The exact details of whether or not there would be an emergency budget etc are neither here nor there.
I have never heard of any proven case of lies by the Remain campaign. The worst you can accuse it of is incompetence, arrogance, complacency and underestimating the power of the right-wing tabloid press, the power of Vladimir Putin and his ability to undermine the West and the absurd behaviour of the Brexit Broadcasting Corporation.