Is this company even legit?????

I was contacted today for a cell phone contract. After providing my account number there was an apparent mismatch between my account number and my last name. The agent Amanda (Mondo MTN) from Durban transferred me to a manager and the manager answered and said they will call me in a couple of days then dropped the call. I immediately contacted my bank to report the matter. Your company is coming across ********** and I will not leave the matter at bay until I have clarity around what it is exactly that is happening. How can you drop the call after obtaining someone's account details???