Help requested!

Hello all, I have recently moved to Canada as a Christian Refugee from Pakistan, I was planting veggies in a plot on our rented accomodation ( an old farm) and I lost my mother's ring that I have worn since she passed away. Always made me feel her near! I was flingng a stone i found in the soil, and I felt the ring slip out and even heard a dull thud when it landed! We looked for it on all fours but no luck. I searched the net for " professional metal detectors" and came across a person in Pickering. He agreed to come over and find my ring for $150. I am on financial aid and it was more than I could afford. So asked him to visit me only when he happens to be in Caledon and charge less. I understand he was being reasonable as Pickering is far. Still a bit high for us so I borrowed a bounty hunter from someone and looked for it without luck. Called the guy again.So when he was in town , he called and came over. He looked for it for a good couple of hours, grid lines and all, found a few coins and old square nails but no ring! I still had to pay $50 and he promised to come back and look for it again for another $25!He hasnt shown up! I request the forum to help me out if anyone can. I live in Caledon on Mayfield road, my cell is 647-657-0423 kindly call if anyone willing to help. Its not an expensive ring but means the world to me. I look for it everyday, its been three weeks now. No luck. I am praying too and asking my mom to help me with finding it. Still waiting.
Obliged, Munawar