The applicant then claims that in breach of that agreement, the respondents procured a separate agreement with his sister and brother-in-law, the legal owners of Blk 383, for a commission of $12,797.20 (inclusive of $837.20 for GST), for the sale of Blk 383. This commission, the applicant says, was in effect paid by him, under the guise of the expenses of the sale. He claims that his sister and brother-in-law had, pursuant to his undertaking to pay for all expenses, deducted from the sale proceeds a sum of $22,852.20, as part of the expenses. He further alleges that his sister and brother-in-law were in collusion with the respondents and they misled him into thinking that the $12,797.20 was due as expenses of the sale, when in fact, it was for the commission for the sale of Blk 383. His grievance is that he ended up paying $18,682.20 ($5,885 + $12,797.20) for the transactions of both flats, when he had orally agreed to pay $5,500 only. In that sense, the applicant claims that the respondents received “double payments”.