FNB Connect has very bad customer service

I am having the worst experience with FNB CONNECT, I phoned in on the 29th of March to give my calendar month notice which means it needs to be cancelled end of April, after explicitly confirming the cancellation date to take place end of April they canceled it on the 1st of April ( what happened to the calendar month notice?) all data, minutes and sms's was cleared. I contacted FNB the morning of the 1st of April to inquire about the situation and they said I requested it to be canceled on the 1st of April that's why everything is cleared....after I explained to the lady that it was not the case she said that they will need to investigate the situation and draw the recordings then they will come back to me in 24 hours, the afternoon of the 2nd of April I contacted them again because I had no feedback then they gave me the same excuse saying they need to draw the recordings and investigate, on Wednesday the 3rd of April a lady contacted me to confirm my cancellation...I then needed to explain the situation again and again she gave me the same speach of investigating and someone will get back to me, I am still waiting for a call and it is the 8th of April.