Lack of response & Failure to amend paid flight

After over 20 emails BudgetAir are unable to correctly amend a return flight date that has already been paid for. Their response time to emails is meant to be 24 hours yet I have only received responses from them 3 days or even longer after each of my repeated requests. Most of my emails received no reply at all. I have even phoned Holland (their head office) but the number just cuts off. Their SA website has no contact number on it either. I resorted to not only emailing them but also to sending their facebook page a copy of my emailed requests. Not one response was received to my facebook messages. I now have a flight that is due to take place on 23 Nov 2015 that has been paid for and simply needed to be changed to one of 4 dates in Feb or June 2016. The invoices I receive via email from BudgetAir are also incorrect, i.e. I request a flight from George to Cape Town & they indicated Cape Town to George. I have never encountered such *********** service & feel its a huge injustice to the public to receive payment for flights yet to not be available or contactable to assist with any basic queries required thereafter. Please do not use this company & spare yourself a nightmare!