Ruined my good credit rating

I app**** for an account at their Constantia branch and was told I needed to supply 3 months bank statements. Their credit department then ran 3 credit checks against my account and now my Clearscore rating has plummeted. It states that I app**** for credit 3 times recently and was turned down when in fact their *********** credit department ran the single application three times. Im keeping my number and moving over to MTN because I am so cross