Data sim signal problems for 3 months

So Cell C im going for 3 months with signal problems on the data sims on 3 devices. Call after call to cell c the problem is still the same. Cell C in Ilanga Mall said i must get new data sims. Did that R370 later still the same problem. Took al 3 devices to the store to check and fix....... no change. Logged network complaint form at the store. A week later no change. Case ***. This is really pathetic. I cant believe that no one in Cell C can fix the problem. Look at your FB pages and see how many people complains about the same problem. Some more than 3 months. Unfortunately we are stuck with this **** network and cant switch back to Vodacom.