Poor Service At Ackermans Three Rivers

I experienced very poor service at ackermans store Three rivers(24/06/2019 at 14:30).I purchased an item and the payment went through from my account even my transaction history showed it but due to the fact that they couldn't print out a till slip i had to wait for 30-40minutes for them to confirm with my bank as a results i was late for work.my concern is that they knew about the printing problem as i had them saying even on Saturday the till was giving them a same problem.