Poor Service

I Have been trying to change my details from Nedbank to Grindrod Bank without any success for three days now. On Monday I was promised I will have the document in 2-3 hours but nothing. Tuesday I called again and I was advised that the document will be sent to me by 3pm still nothing. Today I requested to speak to a manager which they told me is Joshua Shata, we senthim a mail because apparently they cannot provide me his number and he still has not answered me. This is very poor service as I don think there is anyone in this company who knows what the are doing. Honestly I disgusted and dissapointed.