Mandate form completion error

I have signed the mandate form 3 or 4 times with no problem ,but now when i sign it says completion error they have written my first name as my last name and theres no option to edit .u cannot access my funds and they are hard to reach i dont know how many emails ive written in one day to only get the same automated “we have received your email and we will get back to you “ respond .the numbers on the email rings and nobody picks up.the number on google says does not exist.the call centre no someone picked and told me they will transfer to the mandate team and someone will get back to me in about 30 minutes that was 3/4 hrs ago.now that I've come to hello peter i realised its a lit of us.bidvest surely you've seen the high amount if people calling in you just dont care.