Pay & Clear Payment not processed

On the 11 Jan I tried to make a payment from my FNB cheque account to my Standard bank account and needed to use the Pay & Clear option. It turned out I can not do it because there is online banking limit of R35000 for Pay & Clear which I could not increase. I contacted online banking and they tried to assist me, but turned out they could not help too and they suggested that I use FNB banking app on my cellphone where the limit is up to R350 000. I went through the procedure of activating the app on my cellphone and by 14: 08 p.m. managed to do the payment via my FNB mobile app. However the payment was not executed in 1 hour, so I called to inquire and had to go through a very long procedure of authenticating myself (was on the phone about half an hour being transferred from one person to another). Then I was asked to confirm the transaction AGAIN via the FNB app, which was done and was told that the transaction will be executed in a maximum of one hour. Yet it has not been processed, so far. Instead I see a transaction with Nul value on my transaction history. I am so frustrated having to spend the whole day struggling with FNB to sort out issues. Extremely disappointing experience.