1. We will apply for equal coupon compensation for you based on the current market value of the second hands miners; the coupon value is 1127usd
They are lying to you, used S17+ go for above $1500, for $1127 you can only get S17-56th.
4. We can also help you contact the buyer, and sell the coupons in your hand at 90% of the coupon price, so that you can get the corresponding USD or BTC;
Point number 4 is really funny, they want to persuade you to sell them the miner at a much cheaper rate, nobody is going to pay 90%, they will be that "buyer" so (1127-30$)*0.9 = $987.3, also expect a 5-10% less with an excuse of bitcoin price is lower on the exchange they use.

Sorry that this is happening to you man, Bitmain is indeed a terrible company to deal with.
