MTS mblaze — Speed issue

Address:

Chennai, Tamil Nadu

hi,
i am using MTS mblaze zte ac3633 post paid plan of 999 for past 9 months, i got speed around 200 kbps to 400 kbps in first 6 months, since this jan net disconnect frequently and speed also get down below 100kbps.. it is not continuously some times it goes under 20 kbps. i made complaint 3 times no response. they asked me to visit showroom but tere is no solution..