In the Anime Honzuki no Gekokujo season 2, episode 4 from 19:56 onward the main protagonist says "Arigatou Gozaimasu", to thank the high priest and is immediately corrected by him with something that, at least I hear as - "Arigatou Zongdzi-masu".
After extensive search on the internet and discussions with at least two people that speak Japanese, at various levels, I found that there is no such phrase in Japanese, yet I still hear it in a Japanese anime, voiced by Japanese actors...
I found that Zongdzi is a rice dumpling, searched for all words and expressions that can end on "masu"(and since this is a polite ending there are a lot of them), checked in few online Japanese-English dictionaries but couldn't find anything.
In the English subtitles version it was translated as "Please accept my deepest gratitude" and was specified that this is a way for a noble women to thank for something. I searched the web for a direct translation of the quoted phrase in Japanese and found quite a few of those, but nothing that is even remotely close to what I hear.
Please, if possible, can someone share what the phrase said in the anime should look like, written in English, I am suspecting it is not Zongdzimasu, and if it wont be a lot of additional work the phrase history and applications.