Complaint Review: Mapei grout products

purchased Mapei grout ptoducts for a tile flooring job I had of over 1000 sqft in three seperate rooms completeing one job through grout before starting the next room. with in  2 month of completion of the job the homeowner noticed that the grout was flaking out and soft and powdery. Stopped in the Tempe plant and ask them to test his grout that I had left from the job. they tested it and contacted me about 2 weeks later and said they would send someone to the job to see it. when he arrived 2 weeks later he offered me no card (which I asked for) said he didn't have any on him and we proceded into the customers house and looked at the grout and in 2 minutes we were done and walk outside showed me the test sample and it was hard and said you must have put too much water into the grout. I have been doing tile work for over 30yrs and mixed this same grout on this job three different times for each location. well I can see that maybe once but not three times on the same job. Anyway he left total time spent with me 20 minutes tops. received an email three weeks later stating nothing more than send writen estimate for re-grout. So i did along with what it would cost including moving the furniture. the estimate was bare bones cost on my part. Three weeks go by so I send them an email and ask what the status was and day later said was in final process would be another week or so 2 weeks later I get a letter stating that I was my fault and there was nothing wrong with the prouduct. The report was filled with false information like it was over a year old (not... 4 months) I went into the plant insisting that this be taken care of and tested ( which is an outright lie ) I went in and ask what is the procedure for what has happened. I wrote them back after receiving the report stating all the things that were mis stated and never herd back from them again. needless to say I will NEVER EVER use ANY PRODUCT from MAPEI. it cost me 1000 to redo the job right with different grout. I have never had a problem like this EVER. For as big as this company is you would think they would have a better CUSTOMER SEVICE. STAY AWAY FROM MAPEI PRODUCTS