Impossible to change CC subscription type online due to bug 'no suitable offers'

My annual subscription for Creative Cloud is coming to completion and I decided to downgrade to the Photography plan as I really don't need more than Photoshop for my work. The account management system in Adobe's site is relatively easy to access and use. However, every time I tried to actually change my subscription to the monthy Photography plan I received a warning response from the system, 'No suitable offers'. So I tried to complete the task using 2 other web browsers and also checking there were no cookie-related issues. But every time I got the same response. I searched for help in the forums but didn't find any help there. The issue is urgent because I obviously want to change my subscription before the current annual one expires in a few days time. I spent hours searching, no luck. So then I tried to find a call number and, it's not easy, I eventually found an 0800 Adobe call centre. The guy who answered was in India. There was no indication as to what charges are involved in using this service. When I'd clicked on the number's link in the web page it returned a 404 page error ie. broken link. He said he could help, that he understood the issues I'd been facing (a bug in their system he said) and then went ahead to help me get the new contract. It took quite a while, including security verifications and sending me an e-mail with a secure link to Adobe's credit card info system - to update it apparently. Eventually I got confirmation that the new contract was in place and was told the cost of the new contract etc. and also that I'll get 8€ refund from the remainder of the old contract. That process took about 20 minutes I reckon. That process should have taken me about 2 minutes online without assistance! And then there's the 2 hours spent trying to circumnavigate the problem initially. And I'm really interested to see my next phone bill and how much that 20 minutes (most of the time just sitting in silence while something was happening on the other end) will cost. Would be interested to hear of similar experiences of others.