Double debit reversed at a lesser amount

Will never buy from footgear and use swiping as a form of payment. I bought takkies at the springfield, durban branch on 2 August 2020. I was double debited for the same amount on 4 November 2020. The foot gear head office ensured that the funds will be reversed. On 7 November only a small portion of that transaction was reversed. Their response to it is that they are aware of the issue and are sorting it out. Highly doubt the bank would make so many errors like this one. A sign of malicious activity on foot gears part or ********** activity by one of the staff members?