Can’t get hold of anyone at Experian.

It seem like this is the only platform that Experian can be reached on. My payment history on one of my accounts is incorrect. The creditor said that they sent the correct information to all the bureaus and require a copy of credit report to escalate the matter. Now I can’t get that on the ‘mycreditexpert site’ and I can’t reach Experian so how do I get this report?