no signal no reception

Since Oktober 2016 my signal deteriorated.I run my bussines on two cellphones (vodacom) as everyone phone on the cellphone for various obvious reasons. The problem is : i do not receive calls, Can not hear clients, Can not phone clients, Can not make emergency calls as i have to leave the house and find a strong signal outside in my yard, Phone calls drop regularly etc. i am in the CBD area 7 blocks from Vodacom headoffice in( Limpopo) Polokwane. very close to a vodacom tower. The situation is unbearable now. I complained to Vodacom (senior technical staff) on rekord,I complained via Hellopeter.com. Vodacom phoned me and promissed to send a contracter to investigate but nothing happened as yet. The situation is serious and are costing me money as i am loosing customers and can not communicate at all. My safety is also at risk now. What must i do to get your attention as to resolve the situation ? Must i migrate back to MTM or what ? i am a loyal customer and once paid for 4 phones, 3 modems etc. i stll pay about 35 to R45,000/ year to Vodacom allone. You are welcome to check my record as well as my complains on the system. I am forced to lodge a complain to the consumer councill now. I will print 10 000 pamflets and distribute them in front of your vodacom shops in the mall to tell people how bad your service/signal really are. i will make a poster and display it as well .I am desparate now.