Query on insurance policy

I am so F*en angry about the bad service I received at old mutual, Old mutual is debiting my installments on the wrong date < I spoke to their consultant on numerous times to correct the date but its still not yet been done, even today they ran a debit order and it will be unpaid due to insufficient funds in the account ,I have requested them to deduct on the 20th Monthly not 25th Monthly, I had to deal with a rude consultant who said he will investigate on the matters ,it`s now 3 months and nothing happened, I am not sick and tired of their empty promises ,I regret using their services because they are messing up my payment profile.