5 weeks of slow LTE, and no resolution

I rec'd my Lte modem as part of th uncapped Lte package on 11Feb 16. From the start, the speed has been incredibly slow on weekends and in the evening (betw 0.5mbps and 2mbps), well below the max of 90mbps. I logged the 1st call for slow speed on 14 Feb 16, case ***1. After many follow ups from me, eventually the external antenna was installed on 1 March. The installer stated I should get a min. of 20mbps with the ext antenna at all times. The ext antenna did not improve the situation, and I logged a 2nd call on 3 March for slow Lte. I have contacted 180 almost daily since the 3 March, spoken to numerous supervisors, emailed them,and got nowhere. I get the same story everytime, \we will escalate\", \"an email will be sent to technical\", \"we will follow up\", and I get no response. <br> Nobody comes back to me. Technical is meant to come out to see what the issue is, but absolutely nothing happens. To me, it appears that the antenna is pointing to the wrong tower, but I need someone to look at it.<br> Due to the number of calls logged with escalations, the last call number I have is ***1. ***1 was closed due to dupliation. I need someone to come back to me very URGENTLY. <br> "