I sent experian a certified letter, return receipt requested. Disputing late payments with my XXXX XXXX account. ( They are reporting I was late last month ) I included in this dispute, the actual trade line from my Experian Credit report, A print out of all my received payments from XXXX website, A letter signed and dated by me, asking for them to do a verification of their reporting. I received back a letter saying.. " We received a suspicious request regarding your personal credit information that we have determined was not sent by you '' they went on to say they are ignoring my request. 

This was a legitimate dispute, there is no reason to think it was from anyone else.