Very unhappy old mutual client

I opened a tax free savings account and paid on time because it was a debit order, they are quick to take your money but can't pay out your claim, the money was really for an emergency but I've been fighting with them for over 2 weeks now, they now claim that I have missed payments for certain dates but I have the smses to show that they deducted from my account, I was hopeful to find a good company for investment and my whole plan was to leave my entire inheritance for about 5 years but I want nothing to do with them, please people think 10 times before giving them your money, at the end of the day it's like I'm trying to get a loan from them when it's my own hard earned money