Security code is invalid. - Cannot Update or Purchase Apps

Question

Same issue as so many others. Again (this happened before but all I had to do was renter my credit card info). I was able to delete account and re-enter in both iTunes or online and it worked but not this time. Either the recent Safari update, iTunes update or iOS 4 killed the ability to use my nextwave Titanium Pre-paid credit card which I was using for over a year and a half with no problem. I was shipped a new card a few months ago, but up until yesterday, it was working absolutely fine for updates and purchases on the iTunes Music Store in Canada, even with a new security code. As it stands I can't update any of my apps now and no changing of the credit card through either iTunes, Apple.ca, or the iPhone seems to allow my security code.
After speaking with Apple Canada Tech this morning, it appears to be an issue with prepaid cards. However, I do not use another credit card, and it has worked just fine prior to updates. I shouldn't have to pick up a prepaid iTunes card just to perform updates on my apps, especially when all was fine prior to the iTunes, iOS, or Safari updates. Easily 3 hours wasted trying to get this resolved so far.
Incredibly frustrating especially to a long-time Apple product user (over 20 years). I'm going to stop trusting updates again and hold off doing any since there never seems to be enough people/time allocated to the bug testing departments to fix these issues. Please Apple, let's get these things fixed before the product's release. You're killing the excitement of new releases and updates again.
Also: when the iPhone brings up the first dialog box that says you must tap 'OK' to sign in, and the dialog button actually says 'Continue', perhaps they should be the same word to show some consistency.

Answer 1

Just thought I'd try reentering my prepaid credit card info again using all of the various ways (iTunes, Apple.ca/Store, iPhone, and MobileMe) and of course nothing worked. Still an invalid security code or even invalid number. Of course, no response from Apple on here and the phone support tells me to try a pre-paid iTunes card. Isn't that tantamount to bait-and-switch when my original credit card worked in the first place? And what if I don't have a budget for that?
It's clear that these credit card issues are affecting a large number of users as Google searches turn up plenty of forum postings about these topics, not only on Apple's boards but other web forums. If there was at least some acknowledgment of the problems and an attempt to fix them, or some kind of iTunes store credit given in the meantime, it would go a long way to building goodwill among your client base.
As an Apple user of over 20 years, I have never seen as many bugs as I have in the last few years. In my humble opinion, while these forums are an excellent start, clearly they are not monitored enough and there is not enough done to correct these problems.
My iPhone 3G is now not only running incredibly slow thanks to iOS 4, but I still cannot update apps - even the free ones - which may solve some of the slow software issues and crashes. Sure, purchasing can be done with a prepaid iTunes card, but that's a practice one shouldn't have to resort to when your original card worked in the first place.
Very frustrated with this great company. You are capable of much better.