Ridiculous bank charges as a result of not being able to change my credit limit allocation

I noted that bank charges have been deducted from my credit card for decline fees. My card declined numerous times due to not having sufficient funds in line with my credit limit split between budget and straight, but also in the same light, I was not able to move this limit split on my app, with the app giving constant errors when trying to change this allocation. I find this unacceptable that the app could not allow me for more than a week to move my credit limit split, and as a result of that, I now had to go and incur ridiculous bank charges due to my card declining as a result of the app not allowing me to set my credit limit... I am a busy individual and do not have the time to constantly check my phone the whole time to see if an app works, but I can assure you, I struggled to move my limit more than once for probably more than a week.