Nevertheless, 50,000 once a week is the general dose provided to non-compliant patients who cannot remember to take several pills every day. Note that the 50,000 was "once a week". A more appropriate dose would be daily. A "non-compliant" patient is not necessarily a "bad" person. They may in fact have a busy lifestyle, such as being a fireman or policeman, and the physician simply decides that to bring their D levels up to speed, a once a week protocol is better. Literature suggests that daily dosing at smaller levels is preferable, all other things being equal.
I was on 50,000 IU once a week for a month and it had nothing to do with being "noncompliant" but because my Vitamin D level was seriously low.
You don't need to go to anyone for medical help, but try to read the instructions more carefully. Over a longer term such a misunderstanding could cause problems. Usually the 50,000 unit dose is "once a week" for non-compliant patients who don't remember to take their pills.
You should be okay, but you do need to inform your prescribing physician to see if you should adjust the dosing schedule.