You are having hypothyroidism and proper medication is given
Generally this medication dose is dependent on your body weight and according to your body weight around 100 mcg is required but this is not increased suddenly but given in proper manner of increasing dose gradually starting from 25 mcg
There was requirement of follow up of 1 month interval with
tsh report and gradual increase of dosage but you have missed some follow up
Next Steps
don't worry and get yourself evaluated