Wrong Installation For Air Con Piping

[dunn 0]

I had my air con piping for my mitsubishi heavy industry air con installed last week and received a call from the shop telling me they had installed copper piping meant for Mitsubishi electric instead, but assured me everything will be alright as the copper piping for Electric is larger than that of Heavy industry and commented that it is even better for me as it is thicker... Is it true? What should i do? To proceed or reinstall piping? Thanks

[terumo 0]

Is your Mit Electric all 9k btu? or with a 18k?