Yup, it's frustrating when grout starts failing due to improper tiling. Here's what I suggest:
Check the extent of the issue, like loose or cracked tiles.
Clean the area and remove debris for better regrouting.
Get quotes from different tilers for your 2m by 2m area.
Prioritize quality over cost for lasting results.
Discuss how long it'll take, given your shower room usage.
Have a written agreement on work scope, cost, and timeline.
Cheers,
Emma