MTN

So today I checked my credit score as I am looking to purchase a new car and found that my score had dropped by 7 points. My account with MTN was listed as in arrears and was listed as a missed payment. I called MTN as I have a debit order going off my account monthly and have never been in arrears. It was confirmed that my account is not in arrears and never was. I then wanted them to amend this with Experian. I was transferred to 7 different people and 45 minutes later gave up and sent an email to Clearscore, Experian and MTN. Clearscore responded to say they have passed on the dispute to Experian to resolve and this will take 20 business days and during this time I will not be accepted for credit until this is resolved. All this because of MTN's inability to resolve their mistake. Shocking!!!