Recent Bank notification challenges

I've noticed recently that card transactions are not reflecting immediately upon completing the payment (whether POS or online). This has caused confusion since I do rely on these instant SMS/App messages to confirm whether such a transaction is successful or not. I hope you guys can fix this. On a side note, Bank notifications used to come from a few numbers (which I saved them already), but since the last month, all notifications started to come from one single number. This is unusual. I hope these are not signs of security challenges.

Happy to turn this positive once attended.

ps. This is not a complaint, but rather constructive criticism as I still prefer FNB over the rest.

Prof Irhuma