How to I describe and send a comlaint re: T-mobile billing?

I would like to file a complaint to T-mobile for suspending my account after 1 month of non-payment.

This is what happened.

I got an E-mail from T-mobile, telling me to pay my bill.  I never received last months bill, so I didn't pay it.  I then paid the amount quoted for 2 months!  This has occured before where I never saw a bill.  I paid $114 for a 2 month period.

When I tried to use my phone, it recording told me that T-mobile had suspended my phone; and if I wanted it back - I need to pay $77 today.  I needed my phone, so I paid the $77 just for that reason.

IF I had seen a bill last month, I would have paid it - but I didn't.  It is not the first time this has happened; BUT my account has NEVER been suspended over 1 month of non-payment.

In summary, I paid for 2 months of service - then an additional $77 so I could make a phone call!  I could NOT understand customer service (thick accent) and I already know the math. 

All my past payments have been on-time; and my complaint is that they suspended my account without contacting me…..I should NOT have had to pay $77.00 just to turn my phone back on - when I already paid for the 2 outstanding months.

I may switch providers just because of this unless Tmobile can fix this.