Ref I***-9 - owner deceased - change phone to pre paid

My father passed away on 12 May 2019. Since then I have been struggling to change the phone number from contract to pre-paid. I took the relavant documents in to our local branch in Tubatse mall where I was informed to e-mail it directly to Vodacom. After 7 months Customer care advised that I was sending the e-mails to the wrong address and that I need to send it to ***. In March I was Told it's the right e mail address but my Subject was Incorrect. I have been sending it nearly on a daily basis. I again phoned today 14 April 2020 and spoke to a Ronel and Charlene again without any success. A supervisor will return my call. Needless to say I am still waiting. At the end of each month I must pay a amount of plus +/- R300 although I am using the phone as pre-paid. I have never experienced such poor service. As result of this poor service and signal problems I switched my other 4 contracts to MTN.