AC fan won’t turn off

I live in a really ancient house; My condo was built in the 1920s plus it is almost falling apart. I have lived here for about ten years now plus I have done a lot of labor around the arena to help restore it to its original design. However, there are somethings on an ancient condo that you just can’t restore without replacing. I have been fighting with a local HVAC supplier because I don’t’ want to have to update the entire HVAC system, but I think that I am going to have to. I can’t get the air conditioning system fan to stop running all day plus night. I will turn off the cooling system, but that doesn’t seem to help at all because the air conditioning system fan just continues to run. I feel like fixing the air conditioning system fan should be an easy job, but so far the HVAC supplier has been giving me the hardest time about coming out to my condo plus fixing it. I have called the HVAC every single day for over two weeks plus they only respond via email message. I know that I have been giving the HVAC supplier a strenuous time about fixing my air conditioning system fan, but they have not been giving the best customer service, all I want is to not have to spend my money an arm plus a leg to have my HVAC system fixed. However, this is an ancient condo so I know most of the parts for the HVAC system are going to be too ancient plus will need to be updated.

thermostat