I am a rookie when it comes to commercial financing.

If your profit especially ends up being on the lower end it's not much room for error .

I wouldn't message anyone,, but confirm price with everyone from this point on.. if questioned just say was a error in the posting.But if you took an application you'd have to honor the price if the applicant was approved. 

If I did not have 1031 money, I could have invested as a passive in a deal with a successful lead that would have taught me step by step and I would not have made those 2 rookie mistakes.I learned the hard way.  

@Bart Hedgcock, @Gail Kaitschuck , thank you both for your advice, I think I made a rookie mistake and did not add any  early termination clause in the lease, does the texas state law automatically takes over and protects me in this case?

I feel like maybe a class action suit could help them see the error of their ways. 

Unless you have an errors and omissions clause in the P&S contract, the closing is final.

., located at ..........................Each month rent will be paid in the amount of $200, per week, starting October 5th, 2017 and ending at the termination of this lease agreement, or otherwise previously agreed upon, as stated below, including the months which have 5 pay periods.The extra pay periods will accumulate and may be applied toward the last months’ rent.It may not be misconstrued that...........................(................) is responsible for the payment of rent, and this lease agreement is between the parties stated in the third paragraph of this Lease Agreement.If an error, or stoppage, occurs in the automatic deposit, either by the Resident or her employer, it shall be paid immediately by the Resident ................and all other late payments, fees and conditions of this agreement will apply.Should the Resident wish to change the method of payment, the Owner must first be notified in writing in such a time frame that rent will be paid in full and on time according as follows:  Rent and/or other charges are to be paid at such place or method designated by the owner as follows check or money order by mail, or cash in person.

You found an error, fix the error.

Then you start with your appraisals, loans etc It seems that there is a communication   error between your agent,listing agent and yourself