Bad service!!

My wife booked a swimming lesson with Kelly for our twin girls. The booking was confirmed for 13:45 on 4th September 2015. My wife and girls arrived on time for the appointment, just to be told that Kelly is not there for the lesson. NO apologies as yet, they called Kelly and told my wife that she is on her way. In the meantime while my little girls we're waiting for their lesson, someone else took over the lesson and it was by all means a very below standard effort from Headstart. After the lesson of 15 minutes for each of my girls, still NO apology for the swimming teacher not being there. Then, on the Sunday following the swimming lesson we received and invoice via email, still with no apology or explanation. The invoice for the full month of swimming lessons plus a R150 per child deposit to be paid???? On Monday 7th September 2015 my wife tried to call Headstart at 09:00 AM...no answer or responses to voicemails left. We consider this terrible service and these people should not run a business, especially not a business where it involves our kids.