I hired XXXX from XXXX, Colorado in XX/XX/XXXX to build a prefabricated backyard studio in my property. XXXX was contracted for materials and also provided a certified professional installer. The studio design was signed off on XX/XX/XXXX and construction began once the material arrived in XX/XX/XXXX 2014. 

Due to ongoing issues with the installation, I withheld {$850.00} XXXX XXXX XXXX of the original {$20000.00} owed. {$19000.00} XXXX XXXX XXXX were paid by me prior to the completion of the construction as per the contract with XXXX XXXX. 

XXXX referred the non-payment to a debt collection agency, Agency of Credit Control XXXX as per the letter dated XX/XX/XXXX that I received from the agency. 
However the Agency of Credit Control XXXX has alleged that I owe {$10000.00} ( XXXX ). 

I have notified XXXX and the Agency of Credit Control XXXX that XXXX i ) The amount {$10000.00} of debt alleged by them is incorrect, ( XXXX ) The actual amount {$850.00} owed by me is being withheld pending repairs due of faulty construction. 
XXXX iii XXXX The Agency of Credit Control XXXX must notify all the credit monitoring agencies contacted by them about ( i XXXX and XXXX ii ) listed above.