Very let down and disappointed by First National Bank / Wesbank

I have existing finance with Wesbank for over a year now. This is my second vehicle I have financed through them. It is registered in my business name. However, my business name has changed and I require to transfer the existing deal to the new company name. I have also moved my business account over to FNB Ilanga Mall, because of the affordable fees and facilities. I have been trying for over a week now to get this done. I have sent through all my documentation to Private finance, they declined because I am not banking with FNB for 12months. I have called the Relationship Manager at Commercial Banking In Nelspruit for help, she refered me to Wesbank, person by the name Thandi. She called me a day later to advise that she cannot help me, after explaining all to her, that I must go back to Private Finance. Then she referred me to someone in Jhbg, just to tell me she is not working with it, and gave me another number Ie. ********** 821. I cannot get through to this number. What do I do now? Do I stop paying the current vehicle with immediate effect, or will my bank assist me to get this done to enable me to continue with my payment and my business? Because I rely on my vehicle for an income. Thank you