Arbitrary Premium Increase Even Before Policy Commences

I took out a motor xtenda policy with Hollard on 1 July 2020.

Policy was to commence on 31st July and cover was included for two vehicles (Toyota RAV4 2.5VX A/T, 2013 and Mercedes Benz C220 Bluetec Avantgarde A/T, 2014).

The total premium was indicated as R682.45 and premium collection date indicated as 15th of each month.

I called back the same day asking that the premium collection date be changed from 15th to 31st of each month and that the Mercedes Benz cover be changed to one limit category higher.

I was sent my amended policy documents the same day with the correct information reflecting, premium collection date on 31st of each month and higher limits indicated for the Mercedes and a new total premium of R717.13 (which is what I was told when I called in to make changes, so it was correct).

I have now received an sms and email from Hollard indicating that my first premium collection will be R762.18 and will be collected on 31 July 2020.

That is not the correct premium as per the last policy ammendment and documents sent to me.

I have called Hollard and they cant seem to figure out where the increase in premium came in and confirmed that new policy documents reflecting this new amount was never sent to me.

This is not a good sign, with me just starting a policy with Hollard, to see that you just arbitrarily increase the premium from what was promised and reflected in policy documents sent to me.

Rectify this immediately or else I will take my business elsewhere.