there are no seventy years that refer to serving of Babylon for seventy years
Jeremiah chapter 25:
all the families of the north,” is the utterance of Jehovah, “even [sending] to Neb·u·chad·rez´zar the king of Babylon, my servant, and I will bring them against this land and against its inhabitants and against all these nations round about; and I will devote them to destruction and make them an object of astonishment and something to whistle at and places devastated to time indefinite. 10 And I will destroy out of them the sound of exultation and the sound of rejoicing, the voice of the bridegroom and the voice of the bride, the sound of the hand mill and the light of the lamp. 11 And all this land must become a devastated place, an object of astonishment, and these nations will have to serve the king of Babylon seventy years.”’
12 “‘And it must occur that when seventy years have been fulfilled I shall call to account against the king of Babylon and against that nation,’ is the utterance of Jehovah, ‘their error, even against the land of the Chal·de´ans, and I will make it desolate wastes to time indefinite. 13 And I will bring in upon that land all my words that I have spoken against it, even all that is written in this book that Jeremiah has prophesied against all the nations. 14 For even they themselves, many nations and great kings, have exploited them as servants; and I will repay them according to their activity and according to the work of their hands.’”
15 For this is what Jehovah the God of Israel said to me: “Take this cup of the wine of rage out of my hand, and you must make all the nations to whom I am sending you drink it. 16 And they must drink and shake back and forth and act like crazed men because of the sword that I am sending among them.”
17 And I proceeded to take the cup out of the hand of Jehovah and to make all the nations drink to whom Jehovah had sent me: 18 namely, Jerusalem and the cities of Judah and her kings, her princes, to make them a devastated place, an object of astonishment, something to whistle at and a malediction, just as at this day; 19 Phar´aoh the king of Egypt and his servants and his princes and all his people; 20 and all the mixed company, and all the kings of the land of Uz, and all the kings of the land of the Phi·lis´tines and Ash´ke·lon and Ga´za and Ek´ron and the remnant of Ash´dod; 21 E´dom and Mo´ab and the sons of Am´mon; 22 and all the kings of Tyre and all the kings of Si´don and the kings of the island that is in the region of the sea; 23 and De´dan and Te´ma and Buz and all those with hair clipped at the temples; 24 and all the kings of the Arabs and all the kings of the mixed company who are residing in the wilderness; 25 and all the kings of Zim´ri and all the kings of E´lam and all the kings of the Medes; 26 and all the kings of the north who are near and far away, one after the other, and all the [other] kingdoms of the earth that are on the surface of the ground; and the king of She´shach himself will drink after them.