Grandfathered Simple Choice

I'm not sure where to even start because we have had numerous issues with our account starting in June, that still have not been completely corrected and resolved, but from reading the various replies here, the issue that I think we just may have inadvertently created for ourselves because we have a Simple Choice North America 6G Family Match account (that my husband has had since joining T-Mobile 12 years ago).  However, last night we had them finally remove 2 of our 4 lines (we had requested this removal in June but it never was completed and our other billing issues took a huge priority over that one.) We had been paying $10/per line per month, plus taxes and fees and we didn't have a need for them since his daughter is now on her own plan and he didn't need a plan for his tablet anymore, so they were about $40/month we would save. We were reassured multiple times that we would be able to add back any lines we wanted (up to 6), but said we may not get the same price/month as we currently had, but we noticed our August bill that inexplicably both lines went up to $20/per line and the reps couldn't tell us the reason for the increase and we didn't push it since we were removing them anyway.  But YIKES!  Reading all of the posts here makes me worried that they misinformed us BIG TIME, and if that's the case, I think he will want to leave T-Mobile, considering the very big issues that are still ongoing with our billing invoices. Sorry to hear a lot of you have been told you can't re-add lines.