| 10. | OTHER OPERATING EXPENSES |
| 2015 | 2016 | 2017 | ||||||||||
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Impairment losses for doubtful debts and write-down of inventories |
4,054 | 4,173 | 3,955 | |||||||||
|
Commission and other service expenses |
21,327 | 23,826 | 22,658 | |||||||||
|
Advertising and promotion expenses |
3,325 | 3,188 | 3,894 | |||||||||
|
Internet access terminal maintenance expenses |
3,792 | 3,857 | 3,547 | |||||||||
|
Customer retention costs |
3,521 | 3,775 | 3,987 | |||||||||
|
Auditors’ remuneration |
64 | 69 | 74 | |||||||||
|
Property management fee |
2,238 | 2,150 | 2,169 | |||||||||
|
Office and administrative expenses |
2,102 | 1,972 | 1,919 | |||||||||
|
Transportation expense |
1,790 | 1,676 | 1,642 | |||||||||
|
Miscellaneous taxes and fees |
964 | 1,375 | 1,251 | |||||||||
|
Service technical support expenses |
3,628 | 4,641 | 4,355 | |||||||||
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Repairs and maintenance expenses |
852 | 852 | 824 | |||||||||
|
Loss on disposal of property, plant and equipment |
1,995 | 355 | 3,489 | |||||||||
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Others |
3,275 | 2,676 | 3,402 | |||||||||
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| 52,927 | 54,585 | 57,166 | ||||||||||
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