Like talking to a brick wall!

Vodacom again contacted me re my complaint of poor reception, asking if I was going to purchase a booster!!!! My reply was the same as the numerous other calls, in that, this is not an option, and as they cannot supply me with a reception that I used to receive, I want written confirmation that they will cancel my contract, without penalty, and I will be free to sign-up with a company that I know can provide a good reception in our area. The caller agreed that Vodacom could not improve reception in our area in the foreseeable future . Quite frankly, it is like talking to a brick wall, as nothing has transpired since.