4 Months of bad service

Confirmed 3G coverage on mtn web site. Bought a wi-fi 3g router.<br> First couple of months no problems. 4 Months back started to experience \un-workable"signal.<br> There has been no changes on my side. Peak times cannot browse web pages. Off peak times browsing is very slow.<br> Have logged a call (Tue 2015/04/07 04:08 PM) with Reference Number: ***.<br> Response times of call centre is appalling.<br> 4 Months and this issue is not resolved yet.<br> Last request from them was to call a number. How do you call a number from a wi-fi Router?<br> <br> """