1)there is no harm in attending police station on 11th July 2017
2) deny allegations made of dowry harassment
3) mention that you are willing to reimburse expenses incurred provided they give supporting bills of the expenses
4) mention that marriage was called off on account of suspicious nature of in laws as they doubted your character
5) refuse to bow down to pressure tactics and pay Rs 10 lakhs demanded by the in laws
6) if any FIR is lodged obtain AB and contest case on merits
7) you can file complaint of defamation against them under section 500 of IPC