Please advise regarding house sale

[wannabegood]

We put our house on the market 10 days ago, we had 23 viewings and an offer of £173,000 the buyer has sold and wanted to complete in 3 weeks
We felt it was too low so they upped it to £175,000. Since then without my consent the estate agent stopped booking viewings and have been pressurising us to take the offer. My daughter in law rang them and they refused her an appointment to view!! In the meantime a friend has viewed with his daughter and she has offered 170,00 plus 5000 cash. He has brought round a mortgage in principal letter and asked if its a deal. Now I havent got a clue what I should do next and I am panicking!! please can anyone advise?

[wannabegood]

thanks I ill check the website