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chessmec: Many, many moons ago, when I was a clubplayer, we always played with the rules that you weren't allowed to offer a draw twice, without a draw offer from the opponent in between.
But I can't find that rule in the FIDE laws of chess. However, I did find the following rule:
12.6 It is forbidden to distract or annoy the opponent in any matter whatsoever. This includes unreasonable claims or unreasonable offers of a draw.
Failure to comply with this rule can be punished by anything from a warning to expulsion from the event. (Articles 12.7 and 13.4).