I was trying to replace the valve & washer on my dripping bathroom tap.I did the cold no problem, the tap bonnet on the hot tap is so tight/corroded that when I used the adjustable wrench to loosen it, I actually managed to bend the copper pipe beneath (I am female and not very strong so this was a surprise - potentially a sign of weakened copper?)

Is fixing this something I can do myself? I think the existing taps are these, and could be up to 23 years old https://www.bunnings.com.au/caroma-wels-5-star-6l-min-chrome-lead-free-elegance-ii-basin-set_p0584703 but I have no idea about installation/whether repurchasing those tops includes the copper piping beneath. Also no idea how I'm going to get the existing tap off given I can't unscrew it. Help?