Are there grammar mistakes?
Thank you for writing, Mr. Pierre.
In first of all, we want to apologize for all the inconvenience that we caused. We have checked your complaints with our corresponding department, and these are the resolutions.
About the technical support that you received, we have informed to the quality department.Although, I would like to ask you in which way our service was inefficient so that we can improve our performance. Other than the cold food, there was a delay in the delivery reported to traffic. In addition there were issues regarding your reservation, Finally related to the charges you mentioned we are looking into the ways we can solve this problem refunding your money, making the fair charge, for the purpose of rewards this situation we have decided to reduce to 70% the total amount of the cost.
Best regards Guillaume Medrano

Question

Are there grammar mistakes? 
Thank you for writing, Mr. Pierre.
In first of all, we want to apologize for all the inconvenience that we caused. We have checked your complaints with our corresponding department, and these are the resolutions.
About the technical support that you received, we have informed to the quality department.Although, I would like to ask you in which way our service was inefficient so that we can improve our performance. Other than the cold food,  there was a delay in the delivery reported to traffic. In addition there were issues regarding your reservation, Finally related to the charges you mentioned we are looking into the ways we can solve this problem refunding your money, making the fair charge, for the purpose of rewards this situation we have decided to reduce to 70% the total amount of the cost. 
Best regards Guillaume Medrano

bluebellprince · Answer

"First of all, we want to apologize for all the inconvenience that we have caused." 

"About the technical support that you received, we have informed the quality department."

"Other than the cold food, there was a delay in the delivery due to traffic."

"In addition, there were issues regarding your reservation. Finally, related to the charges you mentioned, we are looking into the ways we can solve this problem by refunding your money and making the fair charge. For the purpose of rewards, we have decided to reduce the total cost to 70%." 
 
"Best regards, Guillaume Medrano"

Very good! Just some small errors.

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