Terrible Service from ADT

I requested your service over 12 months on a property that already had the hardware installed - from previous owners. Was paid a visit by a lady called Lindiwe Kunene who completed a 12 month contract to which I signed to be debited on the 29th Jan. I still have the carbon copy of the agreement. Instead on the 13th Jan I get debited and then again on the 14th Jan. I call Lindiwe Kunene to explain what is going on, to which she said she'd call me back in the afternoon. She has yet to call me! It's BULL**** ADT, it really is...and pathetic service from Lindiwe! She needs to pull thumb...