"their/there"; "formerly/formally"

       Yes, I like language in print to acknowledge the "tongue" as spoken.  Hence I also sympathize with writers who confuse words which sound alike but are different.

       A letter from our dentist's office this week said, "I'm respectfully asking patients to please check there schedules and make sure they will be able to make their scheduled appointments."  One "their" is spelled correctly, and one isn't. 

       The same communication wrote of the dentist's 24 hour cancellation "policy (formally 48 hour)."  The "formally" for "formerly" mistake is perhaps understandable because the sound is close.  But we call such mistakes "illiterate" because language appears in letters (liter) as well as sounds, and the written version must be respected as well. 

       Someone should have caught these mistakes!  It is a professional office that now looks illiterate to its patients.