The worst service ever!

I got a call about a credit card limit increase. Sounded great (I mean, who doesn't want more debt) so obviously I agreed to it. The call center agent asked for my permission to pull all my bank statements (or whatever it is they require) and I agreed. She said once everything is cleared I will be credited in 7 days. And that was it, she didn't say anything about me having to email any documents and I didn't think I had to with it being 2018 and all. 7 days came and went and after like 10 days (promised credit still not available and said call center agent MIA) I start getting an sms saying something about a final reminder to send through proof of income and ID to finalize the increase. Sometimes the sms was nice and said it's a "gentle reminder" which gently came about 3 times a week. At this point I was annoyed since I wasnt told that I would need to send these documents because I would have obviously sent them straight away. So after about 20 of these harassing sms's I eventually find the time to send these documents. After another few days I'm still getting these sms's and still no credit so I call the standard bank customer line, after 15 minutes I get to speak to an agent she tells me that I will just have to wait a bit and call again at the end of the week. I could have decided that myself and also saved that mini fortune it will cost me for that 20 minute phonecall. I decide to give it more than a week, call back again, wait another 20 minutes only for the agent to tell me that someone will contact me that day. That day has come and gone about 7 times since then and right now I am at my wits end about something I didn't even ask for in the first place. Oh and I between all this I also sent an email about all of this and still... NOTHING!!!! This is by far the poorest service I have ever experienced anywhere.