"we have increased our prices this week so let us know if you wish to proceed and the quote was for the last property."
Seems to me that you got a quote for one service but then looked for a different one so the fact that there's a difference in price doesn't seem surprising to me. I don't really know what "reserving" a property means here but the work involved may be different and priced differently for different properties. Similarly for conveyancing on different properties.I got a quote for the initial property (B) on 28th February and confirmed to engage their service on 3rd
I found the 2nd property on 3rd March and notified them of it.