Very bad service, harrassing me day and night 10pm, Sunday morning on my way to church, to work to pay R199, when I agreed to a R99 option, not R199

Very bad service, harrassing me day and night 10pm, Sunday morning on my way to church, to work to pay R199, when I agreed to a R99 option, not R199. Everyday they say they are escalating the matter yet everyday they still call insisting on the R199. They want to force me to pay R350 for downgrade or R2000 to cancel. These people are just raising my blood pressure now.