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Are you able to raise numbers as high as you want, just furnace is not warming up to meet the temp you ask for? If so issue is most likely with the furnace not the thermostat
I am thinking the issue may be with the furnace rather than the thermostat.
Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
Then look in blower compartment and see if we have a control board with a blinking light.If so tell me the pattern of that flash.That will indicate what is wrong and tell us where to start troubleshooting.