vodacom bad service

I am so angry with vodacom!!! we recently installed fibre from them and the signal to the outside house was very bad so we called the fibre department on tuesday 04/02 to ask for a signal extender and how it would work if we want one. The lady then told us how the payments will work and that a technician will come within 24-48 hours to come and install / connect the signal extender. we then received the signal extender today 06/02 via couriers and when my husband called to find out when will the technician come out to install / connect the signal extender, he was told that we need to get our own technician / arrange for our own technician, he then told them that this words was not what was said on tuesday 04/02 and they must go back on their recordings, now all of the sudden they can't find that recording only the one where we tooked out the fibre, and now it is also said that the lady who helped us does not work in the fibre department she is in another department, but why did she then answer and helped us with the signal extender!!! this is very bad service and i need help to take it up with the highest manager in vodacom because this is unacceptable for me !!!! please can someone help me with this issue.