Equifax.... how to fleece the public?

I have a bad credit score with equifax.256 points (very poor) that it is because i only have one active account (mobile phone) and that for 1.5 years did not put myself on the electoral roll. I have never been in debt of more than £500 and do not normally need credit cards etc. I need one now for my wedding but my low score has meant that i cannot get one. I spoke to the most rude person in the world at Equifax who stated that there is nothing i can do but wait until the electoral roll increases to make up for the lost 1.5 years. can anyone help with advice?