MTN DISSAPOINTS YET AGAIN!!!

MTN DISSAPOINTS YET AGAIN!!! I have had a data contract for a number of years now and the current contract has a router. I have always had a linked SIM card which allows me to access the data on another device. All ran smoothly until nearly 2 weeks ago and all of a sudden the linked SIM no longer is able to access the data!!! I have had a helpful agent trying to sort the problem - but to no avail - all has gone quiet now... Who knows what is happening? Will this ever be sorted... Think of alternate providers before going to MTN - over the years nothing but having to fight to get what you want even with upgrading ...