Not Updating My Credit Report

I logged a dispute against my credit report with experian on the 13th April 2015.<br> They came back to me the next day and said it will take 20 working days.<br> <br> On the 11th May 2015 they came back to me and said once I respond with the correct installment amount they will update my profile and send me a new credit report.<br> <br> I have phoned them numerous times since then and every time I get told something else. The first time i was told I would have my updated report by the 15th and still nothing, then I was told I will have it the next week but still nothing, then they told me it was marked as urgent and I will have it by this coming Friday, so today I phoned just to find out that I will only get it next week because they have a huge back log.<br> <br> This type of service is unacceptable and the worst part is that you have to hold on for ? 25 min before anyone even answers the phone.