Customer service

I'm so over this network provider at this point. I've been calling them to enquire about cancelling my contract, they said I should pay certain amounts, fine I did. But when I calm the cancellation department they tell me stories. Till today my cancellation isn't logged. My number is even blocked now from making calls to them because they say "they've been getting unusual number of calls from me". Mind due all along I've been trying to get my things right and cancel the contract. Time is running also. It's been long and I haven't been assisted. Worse I can't call them anymore because they blocked my number from making calls to them