Dtac Promotion - How To Cancel ?

[Chiangmai]

I suscribed for DTAC Maximize promotion 1200 THB per month 4 months ago for my business

But the signal in my area is very bad (probably because I stay near by the ChiangMai Airport ???)

I have complained without any answer from DTAC only"we will check the signal in your area" without any return

Does somebody knows the way to cancel the contract ??

or any alternative (sell the mobile, mobile lost with SIM, reduce the promotion to less, switch to prepaid by DTAC, switch to AIS, ......

or any way to improve the quality (this mobile is on use at the office ) ?

Anbody have sucessfully get any answer from DTAC after complaining ??

ChiangMai

[bonsaimax]

Write DTAC a letter and personally deliver it to their main Office in CM. Be ready with your passport / ID and make sure you have a duplicate which you will have signed by the person who receives it.

Then, go back home and cross your fingers.