as per the norm, my heater control is bust!

i can get fan speed and direction ok but no actual heat control.

ive been looking for ages for a replacement unit but am unable to find one so i was wondering if anyone knows another way to fix it?

maybe a heater control off another car or can you retrofit the older style control easily enough. need I buy new heater? maybe you can help with good heater to buy I will get bad credit loans online 24/7 for it.

cheers