Cannot resolve a mess and take responsibility

This is a follow up on a previous post. Standard bank Cresta handed my 18 year old dormant account over to lawyers because it was R1000 overdue WITHOUT CONTACTING ME FIRST .I immediately went to Standard Bank paid everything and closed all Standard bank accounts. On 4 March someone from Standard bank phoned me from *** (damage control center) and apologised. I told him I have a letter from Standard Bank confirming that my account is closed and paid up in full, but I still need a letter from Standard Bank confirming EVERYTHING from the lawyers have been recalled.He said he will get me the letter. I am still waiting. I NEED SUCH A LETTER BECUASE I AM LEFT WITH THE RISK THAT THERE MIGHT BE A MESS UP WITH THE LAWYER'S PAPERWORK AND I MIGHT GET BLACK LISTED IN FUTURE. Standard bank needs to take responsibility for incorrectly handing my account over in the first place and provide me with such a letter.Today I spoke to Darren Williams at *** and he informed me that such a letter does not exist! Is Standard Bank so pathetic that they cannot generate a non standard letter to resolve a mess that they created in the first place ?