There's a Facebook page for Mei Zen Wellness Center, so that might help a bit: Mei Zen Wellness Institute & Clinic
The phone numbers posted are: 035-5221242, 09053821052. We actually communicated via FB Messenger.
As to address it's in Katrina Subdivision #1 (there's a number #2 close by) and I simply arranged to have someone waiting outside looking for me. There is a small sign but easy to miss. I am new to Duma so all I was able to do is type it into Google Maps and surprisingly it got me to the subdivision and then I saw someone and asked if they knew where and it turned out that was the person waiting for me.
Cost was 500p.