I, too, received a letter from Patrick Burke of HSBC in which I was told that my APR would be increasing from 9.9% to 13.99%. Like you, I was told that the rate increase was due to the country's "economic climate" and that HSBC often has to make difficult business decisions in order to keep their enterprise afloat.
I blasted the CSR telling him that their practices are abhorrent and unethical and that I am opting out of the rate hike. My account is now closed. But I am furious.
I plan on calling Mr. Burke and emailing him (patrick.j.burke@us.hsbc.com) daily, if not more often, to let him know that he should be ashamed of his "difficult-to-make business decisions." This rate increase is nothing more than a money grab by the bank to further put the screws to people while they are already struggling. I also plan on doing my homework to see if there has been any recent legislation that prohibits the banks from such unethical behaviour.
Please just don't lie down and take it-- there is power in many voices. I plan on closing all my accounts with HSBC and taking my business elsewhere. I suggest you consider the same.