Tikona — Connection, Fluctuating Speed, and poor service issue

I had opted for Tikona plan - ADBiBM4M950 (4 mbps till 50GB, 512kbps afterwards) on 6th July 2015 with payment mode as Credit Card and for a duration of 3 months for which the final amount was ₹ 3534/-. I had not received my password so had to go through the password recovery process after which I could finally login and since then I've been facing fluctuating speed where the max speed that I get most of the time is between 0.8 mbps - 1.5 mbps. So to notify Tikona about this issue, I first contacted them via email after which the next day they sent me a guy's name and no. (Mr. Praveen N.G., [protected]) along with a Service Reference Number - 6262681. I had been trying to contact him for about 2-3 days but he would either seem busy or not attend to my call at all. Then again I contacted them via Email (2nd try) but no reply. Then I went to contact them via phone and the guy over the other side either just keeps trying to convince me that the fault is on my side or just keeps telling me to do speed tests and then tells me that he'll call me later or the next day after checking out the issue from their side. Still nothing. Again another call made the next day and again the same thing. When I contacted the same guy third time and in a frustrated manner explained him that I have decent knowledge of the working of Network connections and that the fault is not from my side but theirs, lastly he agrees to send over an Engineer to the site. Next day the engineer comes and after doing another few rounds of speedtests tell me that another new Wireless Access point has been installed somewhere near my area so he would bind the Wireless Access device that sits on top of the roof to the new Wireless Access point. After he did what he wanted, the issue seemed to be resolved as I was able to receive near 4mbps speed as quoted in my plan. I asked him when should I call him if any trouble arises and he told me to wait for 2-3 days before calling again as it could take time. Now since yesterday, again I am experiencing fluctuations and slow speed issue. Please help me out.