Unhappy customer

Not sure if I can trust this company any longer...I had two incidents. I bought an LG Q6 contract with Vodacom Tygervalley approximately 2 years ago. The phone had ads already installed in it. The sales person did not mention anything in this regard. It was some deal which resulted in a very unhappy customer. I simply could not get these ads off the phone. I contacted Vodacom shops/customer care divisions. I liaised directly with LG to resolve the ongoing issue. I consulted tech. specialists. The ads could not be removed and no software can block it. This was not due to any aps loaded on my phone. It must have been some partnership with Vodacom. Incident two. I had another contract which I cancelled telephonically after the term ended. I needed to make numerous follow up calls, compile reports with evidence of the cancellation. The contract was eventually cancelled, however after several months of premiums were taken off. No customer service manager or consultant contacted me with updates or any apology. I am now due for another upgrade, but the question is: "Can I trust Vodacom". I am considering taking my business elsewhere. I have been a client of Vodacom for almost 20 years. I don't feel valued and feel that my two issues just gets consumed by many other customer challenges with this brand.