POOR AND IRRESPONSIBLE SERVICE

I was on a Top-up49 current plan and my plan automatically changed to Yebo 4less. When I call them, no one is available to tell me how it changed the only thing they tell me is that someone called from my cell phone around 01:50am on the 29th of February 2016 (Yesterday), When I tell them it's impossible as my phone is lying next to me at that time, they keep transferring me from department to department, well I held for close to 15 minutes with no response. I want it changed back to TOP-UP49 immediately.