You brought mobile phone from wallmart store recently it is no longer working properly write a letter to the manager

Dear Sir or Madam, I am writing
this
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letter to regarding the problem of mobile
phone
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that I brought from your store. I bought
this
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mobile
phone
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as my son's birthday present ,it seems wonderful but now it become a nightmare for me.Because the mobile
phone
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is no longer working.
For example
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,when I call my son,he cannot hear me and he
also
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cannot receive messages from others,we have tried a lot of solutions but they did not work. I would like to request you to change a new
phone
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for me or refund the money because
this
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product is still in the warranty period or maybe we can discuss a solution.
Although
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it is not a good experience for me
but
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apply
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I would give u a chance to solve the problem.
In addition
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to
this
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,I think that you should check your product quality and make sure the product can be used longer. I am looking forward to your reply Sincerely, JIA HUI

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coherence cohesion
Ensure that the letter is written in a formal tone.
coherence cohesion
Each paragraph should focus on a single idea.
lexical resource
Choose more varied and precise vocabulary to enhance the letter.
grammatical range
Pay attention to sentence structure and make sure there are no grammar errors.
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