Finchoice call centre disappointing

I have a flexi loan with finchoice and been trying withdraw on the mobi site and it does not allow me, as i need to update my financial information, and should phone the call centre for assistance, i have been phoning the call centre for the past week with no luck, you are kept on hold for long and it goes dead, try again nothing. this is my first issue with finchoice, the call centre and service vey disappointed.